怎样简便就怎样算。
|
| (1)原式=(100-1)×21 =2100-21 =2079 |
(2)原式=25×(11+1) =25×4×3 =300 |
| (3)原式=9×(4×25) =9×100 =900 |
(4)原式=(25×8)×(8×125) =200×1000 =200000 |
| (5)原式=654-(317+87) =654-404 =250 |
(6)原式=(45+55)+(53+47) =100+100 =200 |
| (7)原式=270÷(5×6) =270÷30 =9 |
(8)原式=3216÷4÷4 =804÷4 =201 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35