题目内容
计算下面各题.
5.1÷4+4.9×25%
2
×0.75+2.2×
(1
-37.5%)÷(
+40%+2.1)
5.1÷4+4.9×25%
2
| 1 |
| 5 |
| 1 |
| 4 |
(1
| 1 |
| 2 |
| 1 |
| 25 |
(1)5.1÷4+4.9×25%
=5.1×
+4.9×
,
=(5.1+4.9)×
,
=10×
,
=2.5;
(2)2
×0.75+2.2×
=2.2×0.75+2.2×0.25,
=(0.75+0.25)×2.2,
=1×2.2,
=2.2;
(3)(1
-37.5%)÷(
+40%+2.1)
=(
-
)÷(
+
+
),
=
÷
,
=
.
=5.1×
| 1 |
| 4 |
| 1 |
| 4 |
=(5.1+4.9)×
| 1 |
| 4 |
=10×
| 1 |
| 4 |
=2.5;
(2)2
| 1 |
| 5 |
| 1 |
| 4 |
=2.2×0.75+2.2×0.25,
=(0.75+0.25)×2.2,
=1×2.2,
=2.2;
(3)(1
| 1 |
| 2 |
| 1 |
| 25 |
=(
| 3 |
| 2 |
| 3 |
| 8 |
| 1 |
| 25 |
| 2 |
| 5 |
| 21 |
| 10 |
=
| 9 |
| 8 |
| 127 |
| 50 |
=
| 225 |
| 508 |
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