1.-3ma(a²-2a+1-1-4)=-3ma【(a-1)²-5】2.(7+x)(a-1)3.3(a-b)(a-b-2)4.(m-n)【2(m-n)-m】=(m-n)(m-n)=(m-n)²5.(x-y)(x-y)²=(x-y)³6.(m+n)(a²+b²...
(1)-3ma^3+6ma^2+12ma (2)7(a-1)+x(a-1) (3)3(a-b)^2+6(b-a) (4)
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