问题标题:
【八年级下册数学题(1)a²-(x²+2x+1)(2)(y+1)²-9(y-1)²(3)(x²-2x)²+2(x²-2x)+1(4)(x²+4)²-16x²(5)a²-8a²b²+16b四次方(6)(3x+y)(2x-3y)】
问题描述:
八年级下册数学题
(1)a²-(x²+2x+1)(2)(y+1)²-9(y-1)²(3)(x²-2x)²+2(x²-2x)+1
(4)(x²+4)²-16x²(5)a²-8a²b²+16b四次方(6)(3x+y)(2x-3y)-3x(3x+y)
要过程谢谢了
现在只要1,2,6题其他不用了
丛高回答:
a²-(x²+2x+1)=a²-(x+1)²=(a+x+1)(a-x-1)(2)(y+1)²-9(y-1)²=(y+1+3(y-1))(y+1-3(y-1))=(4y-2)(4-2y)(3)(x²-2x)²+2(x²-2x)+1=(x²-2x+1)²=(x-1)^...
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