本题:18a(a-b)²-12(a-b)³
=(a-b)²(18a-12a+12b)
=6(a-b)²(a+2b)
18a(a-b)-^2-12(a-b)^3 ???? 题目是不是有错?
如果是 18a(a-b)^2-12(a-b)^3
=6(a-b)^2(3a-2a+2b)
=6(a-b)^2(a+2b)
18a(a-b)-²-12(a-b)^3分解因式
=6(a-b)-²[3a-2(a-b)^5]
18a(a-b)²-12(a-b)³
=6(a-b)²(3a-2a+2b)
18a(a-b)²-12(a-b)³
=(a-b)²(18a-12a+12b)
=6(a²-2ab+b²)(a+2b)
=6a³-18ab²+12b