谁帮我做因式分解1)5m2n-15mn22)-7x3y2-21x2y33)-15xy-5x24)5a2(x-y)+10a(y-x)5)(x-y)3(y-x)26)5a2(x-y)+10a(y-x)7)(m-n)2-10(n-m)+258)(x+y)2-2(x+y)(x-y)+(x-y)29)4(x-y)2-4(x-y)+15)(x-y)3-(y-x)2

Question

谁帮我做因式分解
1) 5m2n-15mn2
2) -7x3 y2 -21x2 y3
3) -15xy-5x2
4) 5a2 (x-y)+10a (y-x)
5) (x-y)3 (y-x)2
6) 5a 2(x-y)+10a (y-x)
7) (m-n)2-10(n-m)+25
8) (x+y)2-2(x+y)(x-y)+ (x-y)2
9) 4(x-y)2-4(x-y)+1
5) (x-y)3 - (y-x)2

Answer 1

1.5mn(m-3n)
2.-7x^2y^2(x+3y)
3.-5x(3y+x)
4.5a(x-y)(a-2)
5.中间加号减号?
6.重了
7.（m-n+5)^2
8.[(x+y)-(x-y)]^2=4y^2
9.[2(x-y)-1]^2=(2x-2y-1)^2