题目内容

脱式计算.  (12分)  
(1)105÷7 ×18  (2)(603-246) ÷7    (3)520÷(45÷9)  
(4)512-112÷4  (5)45×34+66   (6)(200-162) ×21
                                           
(1)原式=15×18
                   =270
(2)原式=357÷7
                   =51
(3)原式=520÷5
                   =104
(4)原式=512-28
                   =484
(5)原式=1530+66
                   =1596
(6)原式=38×21
                   =798
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