[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
第一道 (x-y)^3-(x-y)
=(x-y)[(x-y)^2-1]
=(x-y)(x^2-2xy+y^2-1)
第二道 -m^4+2m^2n^2-n^4
=-(m^4-2m^2n^2+n^4)
=-(m^2-n^2)^2
第三道 -x^4+8x^2-16
=-(x^4-8x^2+16)
=-(x^2-4)^2
第四道 (x-3)^2-x+3
=(x-3)^2-(x-3)
=(x-3)[(x-3)-1]
=(x-3)(x-4)
第5道 (a+b)(x+y)-3(a+b)(x-y)
=(a+b)[(x+y)-3(x-y)]
=(a+b)(4y-2x)
=2(a+b)(2y-x)
第6道 4(a-b)^3-b(b-a)^2
= 4(a-b)^3-b(a-b)^2
=(a-b)^2[4(a-b)-b]
=(a-b)^2(4a-5b)
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