问题 解答题

化简计算:

(1)(4a2b-3ab)+(2ab-5a2b)    (2)2(x-1)-(3x-5)-x.

答案

(1)(4a2b-3ab)+(2ab-5a2b)

=4a2b-3ab+2ab-5a2b

=(4a2b-5a2b)+(-3ab+2ab)

=-a2b-ab;

(2)2(x-1)-(3x-5)-x

=2x-2-3x+5-x

=(2x-3x-x)+(-2+5)

=-2x+3.

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