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4-12(x-y)+9(x-y)² (x+y)²-4(x+y-1) 4xy²-4x

来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/13 00:06:55
4-12(x-y)+9(x-y)² (x+y)²-4(x+y-1) 4xy²-4x²y-y³ -a+2a²-a³
x四次方+25x²y²+10x³y
4-12(x-y)+9(x-y)² (x+y)²-4(x+y-1) 4xy²-4x
(1)4-12(x-y)+9(x-y)²
=(【3(x-y)-2】^2)
=((3x-3y-2)^2)
(2)(x+y)²-4(x+y-1)
= (x+y)²-4(x+y)+4
=(【(x+y)-2】^2)
=((x+y-2)^2)
(3) 4xy²-4x²y-y³
=-y(-4xy+4x²+y² )
=-y((2x-y)^2)
(4)-a+2a²-a³
=-a(1-2a+a²)
=-a((a-1)^2)
(5)(x^4)+25x²y²+10x³y
=x²(x²+25y²+10xy)
=x²((x+5y)^2)