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初二因式分解数学题

01月06日 编辑 39baobao.com

[初一数学整式乘法与因式分解题目](2x+1)(-2x+1) =(1+2x)(1-2x) =1-4x^2 10.5x9.5 =(10+0.5)(10-0.5) =100-0.5^2 =100-0.25 =99.75 (x-2y) (x+2y)-(x+2y)² =(x+2y)(x-2y-(x+2y)) =(x+2y)(x-2y-x-2y) =-4y(x...+阅读

1.原式=-4(x²-4xy+4y²)=-4(x-2y)²

2.原式=y(y²-6y+9)=y(y-3)²

3.原式=(a-b)(x-y)+(a-b)(x+y)=(a-b)(x-y+x+y)=2x(a-b)

4.原式=-x^4-y^4-2x²y²+4x²y²=-(x^4-2x²y²+y^4)=-(x²-y²)²=-(x-y)²(x+y)²

5.原式=(a-b)(x²+9)+6x(a-b)=(a-b)(x²+6x+9)=(a-b)(x+3)²

6.原式=(a-b-(a+b))²=4b²

7.原式=(x+y)²-4=(x+y+2)(x+y-2)

全过程哦,

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