题目内容
用递等式计算,能简算的要用简便方法计算.
84.67-(24.67+15.3)
1.25×3.2
+
÷
+
÷13+
×
.
84.67-(24.67+15.3)
1.25×3.2
| 1 |
| 4 |
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| 4 |
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| 13 |
(1)84.67-(24.67+15.3),
=84.67-24.67-15.3,
=(84.67-24.67)-15.3,
=60-15.3,
=44.7;
(2)1.25×3.2,
=1.25×8×0.4,
=(1.25×8)×0.4,
=10×0.4,
=4;
(3)
+
÷
+
,
=(
+
)+
×4,
=1+3,
=4;
(4)
÷13+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=84.67-24.67-15.3,
=(84.67-24.67)-15.3,
=60-15.3,
=44.7;
(2)1.25×3.2,
=1.25×8×0.4,
=(1.25×8)×0.4,
=10×0.4,
=4;
(3)
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
=(
| 1 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=1+3,
=4;
(4)
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 13 |
=
| 1 |
| 5 |
| 1 |
| 13 |
| 4 |
| 5 |
| 1 |
| 13 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 13 |
=1×
| 1 |
| 13 |
=
| 1 |
| 13 |
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