3(а-b)+ab(a-b)=(a-b)(3+ab)=(5,5-(-2))(3+5,5*(-2))=7,5*(-8)=-60
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3(а-b)+ab(a-b)=(a-b)(3+ab)=(5,5-(-2))(3+5,5*(-2))=7,5*(-8)=-60