题目内容
计算
(1)(3a-2)-3(a-5)
(2)(4a2b-5ab2)-(3a2b-4ab2)
(1)(3a-2)-3(a-5)
(2)(4a2b-5ab2)-(3a2b-4ab2)
(1)(3a-2)-3(a-5)=3a-2-3a+15=13;
(2)(4a2b-5ab2)-(3a2b-4ab2)=4a2b-5ab2-3a2b+4ab2=a2b-ab2.
(2)(4a2b-5ab2)-(3a2b-4ab2)=4a2b-5ab2-3a2b+4ab2=a2b-ab2.
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