xuxiuqian
春芽
共回答了12个问题采纳率:100% 举报
1.
9×10^2012-10^2013
=9×10^2012-10×10^2012
=-1×10^2012
=-10^2012
2.
9a-6ab+3a=3a(3-2b+1)
3.
7a(x-y)²-4b(y-x)²
=7a(x-y)²-4b(x-y)²
=(x-y)²(7a-4b)
4.
3x(x-y)³+6y(y-x)³
=3x(x-y)³-6y(x-y)³
=3(x-y)³(x-2y)
5.
-10x³y²z³-35xy³z+15x²z=-5xz(2x²y²z²+7y³-3x)
不懂追问~
1年前
9