题目内容
脱式计算(能简算的要用简便算法计算).
85×0.75+15×75%
(
+
)×12+
[1-(
+
)]×24.
85×0.75+15×75%
(
| 5 |
| 12 |
| 1 |
| 19 |
| 7 |
| 19 |
[1-(
| 1 |
| 3 |
| 1 |
| 4 |
(1)85×0.75+15×75%,
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75;
(2)(
+
)×12+
,
=
×12+
×12+
,
=5+(
+
),
=5+1,
=6;
(3)[1-(
+
)]×24,
=[1-
]×24,
=
×24,
=10.
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75;
(2)(
| 5 |
| 12 |
| 1 |
| 19 |
| 7 |
| 19 |
=
| 5 |
| 12 |
| 1 |
| 19 |
| 7 |
| 19 |
=5+(
| 12 |
| 19 |
| 7 |
| 19 |
=5+1,
=6;
(3)[1-(
| 1 |
| 3 |
| 1 |
| 4 |
=[1-
| 7 |
| 12 |
=
| 5 |
| 12 |
=10.
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