用提公因式法分解因式,数学好的进
问题描述：
用提公因式法分解因式,数学好的进
1.2a^2b-8ab^2
2.5(x-y)-6mn(x-y)
3.a(x-3)+2b(3-x)
4.5(y-x)^3+10(x-y)^2
答
12a²b-8ab²=2ab(a-4b)25(x-y)-6mn(x-y) =(x-y)(5-6mn)3 a(x-3)+2b(3-x) =(x-3)(a-2b45(y-x)³+10(x-y)²=(y-x)²(5y-5x+2)可以把过程写出来吗??12a²b-8ab² =a×2ab-4b×2ab=2ab(a-4b)25(x-y)-6mn(x-y) =(x-y)(5-6mn)3 a(x-3)+2b(3-x)=a(x-3)-2b(x-3) =(x-3)(a-2b)45(y-x)³+10(x-y)²=5(y-x)³+10(y-x)²=5(y-x)²×(y-x)+5(y-x)²×2=5(y-x)²(y-x+2)