用简便方法计算。
|
| (1)原式=215+85+370 =300+370 =670 |
(2)原式=(569+101+30)+(432+468) =700+900 =1600 |
| (3)原式=(363-263)×56 =100×56 =5600 |
(4)原式=360÷(4×9) =360÷36 =10 |
| (5)原式=(25+72+103)×36 =200×36 =7200 |
(6)原式=56×(49+1) =56×50 =2800 |
| (7)原式= 420÷7÷5 =60÷5 =12 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35