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15a^3b^2+5a^2b-20a^2b^x-45bxy2m(a-b)-3n(b-a)(a-3)^2+(3-a)a(x-y+b(y-x)+c(x-y)
题目详情
15a^3b^2+5a^2b -20a^2b^x-45bxy 2m(a-b)-3n(b-a) (a-3)^2+(3-a) a(x-y+b(y-x)+c(x-y)
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答案和解析
15a^3b^2+5a^2b =5a²b×3a+5a²b×1=5a²b(3a+1) -20a^2b^2x-45bxy = -5bx×4a²b+-5bx×9y=-5bx(4a²b+9y) 2m(a-b)-3n(b-a) =2m(a-b)+3n(a-b)=(a-b)(2m+3n) (a-3)^2+(3-a) =(a-3)²-(a-3)...
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