题目内容
脱式计算.(写出主要过程,能简算的要简算)
(1)9
×9.8+9.25×
(2)
-0.4+
-
(3)1500÷(25.2×2-1.6)
(4)1.2×
-
×1.25
(5)1÷0.1+
÷
-
.
(1)9
| 1 |
| 4 |
| 1 |
| 5 |
(2)
| 7 |
| 13 |
| 6 |
| 13 |
| 3 |
| 5 |
(3)1500÷(25.2×2-1.6)
(4)1.2×
| 3 |
| 4 |
| 2 |
| 5 |
(5)1÷0.1+
| 5 |
| 9 |
| 10 | ||||
|
| 3 |
| 5 |
(1)9
| 1 |
| 4 |
| 1 |
| 5 |
=9.25×9.8+9.25×0.2,
=9.25×(9.8+0.2),
=9.25×10,
=92.5;
(2)
| 7 |
| 13 |
| 6 |
| 13 |
| 3 |
| 5 |
=(
| 7 |
| 13 |
| 6 |
| 13 |
| 3 |
| 5 |
=1-1,
=0;
(3)1500÷(25.2×2-1.6),
=1500÷(50.4-1.6),
=1500÷48.8,
=30
| 45 |
| 61 |
(4)1.2×
| 3 |
| 4 |
| 2 |
| 5 |
=0.9-0.5,
=0.4;
(5)1÷0.1+
| 5 |
| 9 |
| 10 | ||||
|
| 3 |
| 5 |
=10+1.5-0.6,
=11.5-0.6,
=10.9.
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