题目内容
脱式计算(能简算的要简算):
62.8×19-8×62
| 3.64×[1÷(2
| ||||||||
| 1800-1350÷18×6 | (2
| ||||||||
| 1.9-1.9×(1.9-1.9) | (1-1%×70)÷
|
(1)62.8×19-8×62
-62
,
=62.8×(19-8-1),
=62.8×10,
=628;
(2)3.64×[1÷(2
-2.09)],
=3.64×[1÷0.01],
=3.64×100,
=364;
(3)1800-1350÷18×6,
=1800-75×6,
=1800-450,
=1350;
(4)(2
+1
+2
+3.375)×
,
=(5+5)×
,
=
;
(5)1.9-1.9×(1.9-1.9),
=1.9-0,
=1.9;
(6)(1-1%×70)÷
,
=(1-
)×
,
=
.
| 4 |
| 5 |
| 4 |
| 5 |
=62.8×(19-8-1),
=62.8×10,
=628;
(2)3.64×[1÷(2
| 1 |
| 10 |
=3.64×[1÷0.01],
=3.64×100,
=364;
(3)1800-1350÷18×6,
=1800-75×6,
=1800-450,
=1350;
(4)(2
| 5 |
| 12 |
| 5 |
| 8 |
| 7 |
| 12 |
| 3 |
| 20 |
=(5+5)×
| 3 |
| 20 |
=
| 3 |
| 2 |
(5)1.9-1.9×(1.9-1.9),
=1.9-0,
=1.9;
(6)(1-1%×70)÷
| 2 |
| 7 |
=(1-
| 7 |
| 10 |
| 7 |
| 2 |
=
| 21 |
| 20 |
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