CN203311694U - Teaching aid for demonstrating function limits of college mathematics - Google Patents

Abstract

University mathematics function limit demonstration teaching aid. It relates to a teaching tool for demonstrating the limit of mathematical functions. In order to solve the problem that teachers need to draw a large number of curves in each class in the class of function limit in colleges, which increases the burden on teachers and reduces the time for class explanation. The upper surface of the base is provided with a long slot and a receiving slot, and the lower end of the iron blackboard is inserted into the long slot of the base. The iron blackboard is drawn with a coordinate diagram composed of multiple white abscissas and multiple white ordinates. The iron blackboard is equipped with multiple magnetic pieces that are magnetically connected to it. Red iron wires, blue iron wires, yellow iron wires, green iron wires, and purple iron wires are magnetically connected to the iron blackboard through the magnetic pieces when in use. The red iron wires, blue iron wires , yellow iron wire, green iron wire, and purple iron wire are all put into the described bearing groove when not in use. The utility model is used for explaining the limits of university mathematics functions.

Description

University mathematics function limit demonstration teaching aid

technical field

The utility model relates to a teaching aid for demonstrating the limits of mathematical functions.

Background technique

University function limit knowledge needs to be explained by graphs representing function limits. Sometimes a function limit question needs to use several curves representing function limits to explain clearly. Teachers need to draw a large number of curves in each class, which increases the The burden on teachers also reduces the time for classroom explanations.

Contents of the invention

The purpose of the utility model is to provide a teaching aid for demonstration of the limits of university mathematical functions, to solve the problem that teachers need to draw a large number of curves in each class, which increases the burden on teachers and reduces the time required for classroom explanations. A matter of time.

Above-mentioned purpose realizes by following technical scheme:

University mathematics function limit demonstration teaching aid, it comprises: base, irony blackboard, red iron wire, blue iron wire, yellow iron wire, green iron wire, purple iron wire and magnetic sheet, magnetic sheet is a plurality of, and the upper surface of described base has The long slot and the receiving slot, the lower end of the iron blackboard is inserted into the long slot of the base, the iron blackboard is drawn with a coordinate map composed of a plurality of white abscissas and a plurality of white ordinates, the iron blackboard There are a plurality of magnetic sheets magnetically connected with it, and the red iron wire, the blue iron wire, the yellow iron wire, the green iron wire, and the purple iron wire are connected to each other through the magnetic sheet in the state of use. The iron blackboard is magnetically connected, and the red iron wires, blue iron wires, yellow iron wires, green iron wires, and purple iron wires are all placed in the receiving slots when not in use.

A handle is connected above the iron blackboard.

The diameters of the red iron wire, the blue iron wire, the yellow iron wire, the green iron wire and the purple iron wire are all 2.0mm.

Beneficial effect:

1. The magnetic sheet is used to magnetically absorb the curves representing the limit of the function bent by five different colored iron wires on the iron blackboard. It has the characteristics of simple operation and the iron wires can be reused. The curved curve representing the limit of the function can be used repeatedly, which reduces the labor intensity of the teacher, increases the time for explaining, and improves the teaching quality.

2. Due to the different colors of the five iron wires in the utility model, the curved curve representing the limit of the function can be clearly distinguished, which is convenient for students to watch and teachers to explain.

3. The diameter of the iron wire used in the utility model is 2.0mm, which is soft and easy to bend, and the curved curve representing the limit of the function is smooth and effective.

Description of drawings:

Accompanying drawing 1 is the schematic structural diagram of the front view of this product.

Accompanying drawing 2 is the plan view of accompanying drawing 1.

Detailed ways:

In conjunction with accompanying drawings 1 and 2, the university mathematics function limit demonstration teaching aid includes a base 1, an iron blackboard 4, a red iron wire 2, a blue iron wire 3, a yellow iron wire 10, a green iron wire 11, a purple iron wire 12 and a magnetic sheet 6. There are multiple magnetic pieces 6. The upper surface of the base 1 has a long groove 7 and a receiving groove 8. The lower end of the iron blackboard 4 is inserted into the long groove 7 of the base 1. The iron blackboard 4 A coordinate diagram 5 composed of a plurality of white abscissas 13 and a plurality of white ordinates 14 is drawn on it, and the iron blackboard 4 is provided with a plurality of magnetic sheets 6 magnetically connected to it. The red iron wire 2, the The blue iron wire 3, the yellow iron wire 10, the green iron wire 11, and the purple iron wire 12 are magnetically connected to the iron blackboard 4 through the magnetic sheet 6 in the use state, and the red iron wire 2 and the blue iron wire 3. The yellow iron wire 10, the green iron wire 11, and the purple iron wire 12 are put into the receiving groove 8 when not in use; the handle 9 is connected above the iron blackboard 4; the red iron wire 2, The diameters of the blue iron wire 3 , the yellow iron wire 10 , the green iron wire 11 and the purple iron wire 12 are all 2.0 mm. In order to be able to clearly see the function curve on the iron blackboard in a dark classroom, you can spray the corresponding colors on the surface of the red iron wire 2, blue iron wire 3, yellow iron wire 10, green iron wire 11, and purple iron wire 12. Fluorescent layer.

working principle:

Find the point of the function value on the coordinate diagram, choose a color of iron wire according to each position of the function value point, use multiple magnetic pieces to attract the iron wire to the iron blackboard and bend the iron wire to the limit of the function to be represented curve. The utility model can simultaneously make five curves with different colors and representing different function limits for teachers to explain.

Claims (3)

1. A university mathematics function limit demonstration teaching aid, which includes: base (1), iron blackboard (4), red iron wire (2), blue iron wire (3), yellow iron wire (10), green iron wire (11) 1. Purple iron wire (12) and magnetic sheet (6), there are multiple magnetic sheets (6), characterized in that: the upper surface of the base (1) is provided with a long groove (7) and a receiving groove (8) , the lower end of the iron blackboard (4) is inserted into the long groove (7) of the base (1), and the iron blackboard (4) is drawn with a plurality of white abscissas (13) and a plurality of white ordinates The coordinate diagram (5) of the combination of coordinates (14), the iron blackboard (4) is provided with a plurality of magnetic sheets (6) magnetically connected to it, the red iron wire (2), the blue iron wire (3 ), the yellow iron wire (10), the green iron wire (11), and the purple iron wire (12) are magnetically connected to the iron blackboard (4) through the magnetic sheet (6) when in use, and the red iron wire (2), blue iron wire (3), yellow iron wire (10), green iron wire (11), purple iron wire (12) are all put in the described bearing groove (8) when not in use. 2. The university mathematics function limit demonstration teaching aid according to claim 1, characterized in that: the iron blackboard (4) is connected with a handle (9). 3. The university mathematics function limit demonstration teaching aid according to claim 1, characterized in that: said red iron wire (2), said blue iron wire (3), said yellow iron wire (10), said The diameters of the green iron wire (11) and the purple iron wire (12) are 2.0mm.

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