问题 解答题

(1)(-2xy22•(-x3y4

(2)(a+b)(a+3b)

答案

(1)(-2xy22•(-x3y4)=4x2y4•(-x3y4)=-4x5y8

(2)(a+b)(a+3b)=a2+3ab+ab+3b2=a2+4ab+3b2

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