一张贺卡每张a元，小英买了7张这样的贺卡，用去_1元，小明买了b张这样的贺卡，付出12元，应找回_2元．

题干

一张贺卡每张a元，小英买了7张这样的贺卡，用去____元，小明买了b张这样的贺卡，付出12元，应找回____元．

上一题下一题 0.0难度选择题更新时间:2017-06-13 12:30:17

7a,（12﹣ab）

根据短文理解，选择正确答案。

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