题目

若a<0,则的值为( ) A.3                     B.﹣3                   C.3﹣2a               D.2a﹣3 答案:A解:∵a<0, ∴原式=﹣(a﹣3)﹣|a| =﹣a+3+a =3.6. We did not even make enough money to        (支付……的费用) the food.
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