Question

5(3a²b-ab²)-4(-ab²+3a²b)其中a=-2,b=-3

要过程

Answer 1

解：原式=15a²b-5ab²+4ab²-12a²b
=3a²b-ab²
=ab(3a-b)
将a=-2,b=-3代入式子得：6×(-6+3)=-18

追问

谢谢你。。。。。你慢啦

Answer 2

5(3a²b-ab²)-4(-ab²+3a²b)
=15a²b-5ab²+4ab²-12a²b
=3a²b-ab²
=ab(3a-b)
=-2x-3x(-6+3)
=6x-3
=-18

追问

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