题目内容
脱式计算,能简算的要简算
|
|
55×
| ||||||||||||
| 0.125×32×2.5 | 99.9+0.12+0.1+0.88 | 9+99+999+9×
|
(1)
| 2 |
| 5 |
| 3 |
| 4 |
=
| 2 |
| 5 |
| 3 |
| 4 |
=
| 2 |
| 5 |
=
| 6 |
| 5 |
(2)
| 3 |
| 8 |
| 3 |
| 8 |
=
| 3 |
| 8 |
=
| 3 |
| 8 |
=3;
(3)55×
| 6 |
| 11 |
| 1 |
| 4 |
=30-8,
=22;
(4)0.125×32×2.5,
=0.125×(4×8)×2.5,
=(0.125×8)×(4×2.5),
=1×10,
=10;
(5)99.9+0.12+0.1+0.88,
=(99.9+0.1)+(0.12+0.88),
=100+1,
=101;
(6)9+99+999+9×
| 1 |
| 3 |
=9+99+999+3,
=9+99+999+(1+1+1),
=(9+1)+(99+1)+(999+1),
=10+100+1000,
=1110.
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