题目内容
计算下面各题,能简算的要简算.
(1)57-
-
(2)5.7×20%+
×
(3)4.2÷[
×(1-
)].
(1)57-
| 3 |
| 11 |
| 8 |
| 11 |
| 1 |
| 5 |
| 3 |
| 10 |
| 7 |
| 8 |
| 1 |
| 7 |
(1)57-
-
,
=57-(
+
),
=57-1,
=56;
(2)5.7×20%+
×
,
=5.7×0.2+0.2×0.3,
=(5.7+0.3)×0.2,
=6×0.2,
=1.2;
(3)4.2÷[
×(1-
)],
=4.2÷[
×
],
=4.2÷
,
=4.2×
,
=5.6.
| 3 |
| 11 |
| 8 |
| 11 |
=57-(
| 3 |
| 11 |
| 8 |
| 11 |
=57-1,
=56;
(2)5.7×20%+
| 1 |
| 5 |
| 3 |
| 10 |
=5.7×0.2+0.2×0.3,
=(5.7+0.3)×0.2,
=6×0.2,
=1.2;
(3)4.2÷[
| 7 |
| 8 |
| 1 |
| 7 |
=4.2÷[
| 7 |
| 8 |
| 6 |
| 7 |
=4.2÷
| 3 |
| 4 |
=4.2×
| 4 |
| 3 |
=5.6.
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