试题 试卷
题型:解答题 题类:常考题 难易度:普通
(1)收工时距A地多远?
(2)若每千米耗油0.2升,问从A地出发到收工时共耗油多少升?
计算:2a2b+5ab-(-a2b+3ab)
解:2a2b+5ab-(-a2b+3ab)
=2a2b+5ab+a2b-3ab…①
=2a2b+a2b+5ab-3ab…②
=(2a2b+a2b)+(5ab-3ab)…③
=3a2b+2ab…④
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