题目内容
用递等式计算,能简便计算的要用简便方法计算.
38%×
| 89×6.3+48.9×0.37 | 13
| ||||||||||
2.5×
| 158-92+42-8 | 83.2÷(83.2÷11) |
(1)38%×
+0.4×
,
=0.38×0.6+0.4×0.38,
=(0.6+0.4)×0.38,
=0.38;
(2)89×6.3+48.9×0.37,
=560.7+18.093,
=578.793;
(3)13
-(2
-1
),
=13
+1
-2
,
=15-2
,
=12
;
(4)2.5×
×0.4×2
,
=(2.5×0.4)×(
×
),
=1×1,
=1;
(5)158-92+42-8,
=(158+42)-(92+8),
=200-100,
=100;
(6)83.2÷(83.2÷11),
=83.2÷83.2×11,
=11.
| 3 |
| 5 |
| 19 |
| 50 |
=0.38×0.6+0.4×0.38,
=(0.6+0.4)×0.38,
=0.38;
(2)89×6.3+48.9×0.37,
=560.7+18.093,
=578.793;
(3)13
| 4 |
| 11 |
| 2 |
| 3 |
| 7 |
| 11 |
=13
| 4 |
| 11 |
| 7 |
| 11 |
| 2 |
| 3 |
=15-2
| 2 |
| 3 |
=12
| 1 |
| 3 |
(4)2.5×
| 3 |
| 7 |
| 1 |
| 3 |
=(2.5×0.4)×(
| 3 |
| 7 |
| 7 |
| 3 |
=1×1,
=1;
(5)158-92+42-8,
=(158+42)-(92+8),
=200-100,
=100;
(6)83.2÷(83.2÷11),
=83.2÷83.2×11,
=11.
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