"Multiplication Formula" PPT

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"Multiplication Formula" PPT

The content of the first part: Yiyiyi

Calculation: (a + b)( c+ d)=ac+ad+ bd+bc

Do it

(x + 1) (y - 1) = xy – x + y - 1

1. (x+2) (x-2)= x2-2x +2x-22= x2- 4

2. (1+3a)(1-3a)= 1 - 3a + 3a - (3a) 2= 1 - 9a2

3. (x+5y)(x-5y)= x2 - 5xy+5xy - (5y) 2= x2 - 25y2

What patterns did you discover?

squared difference formula

( a + b ) ( a - b ) = a2 - b2

Multiplication formula PPT, part 2: discussion

Can the following questions be calculated using (a+b)(a-b)=a2-b2? If so, please tell me what a and b in the formula mean in the calculation?

1. (5+6x)(5-6x)

2. (x -2y) (x+2y)

3. (-m+n)(-m-n)

4. (-1/4x-y)(-1/4x+y)

5. (a+2b)(2a-b)

6. (m+n)(m-n)+3n2

Multiplication formula PPT, the third part: practice

1. (a + 2)(a - 2)

2. ( 3a + 2b ) ( 3a - 2b )

3. (-x + 1)(-x – 1)

4. (0.2x - 0.3)(0.2x + 0.3)

5. (-2x + 3y)(-2x - 3y)

6. x2 + (y – x)(y + x)

Multiplication formula PPT, part 4 content: Reason one

Square difference formula (a+b)(a-b) =a2-b2

Notice

In the multiplication of integers, only the multiplications that meet the requirements of the formula can be calculated by the formula, and the rest of the operations are still performed according to the multiplication rules.

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Update Time: 2024-07-02

This template belongs to Mathematics courseware Hebei Education Edition Seventh Grade Mathematics Volume 2 industry PPT template

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