题目内容
| 脱式计算(能简算的要简算): (1)3.5×0.8+7.5×0.8-80% | (2)
| ||||||
| (3)20-(3.84+1.21)×0.4 | (4)35÷[(
|
(1)3.5×0.8+7.5×0.8-80%,
=(3.5+7.5-1)×0.8,
=10×0.8,
=8;
(2)
÷3+
×
,
=(
+
)×
,
=1×
,
=
;
(3)20-(3.84+1.21)×0.4,
=20-5.05×0.4,
=20-2.02,
=17.98;
(4)35÷[(
-
)×6].
=35÷[
×6],
=35÷7,
=5.
=(3.5+7.5-1)×0.8,
=10×0.8,
=8;
(2)
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=1×
| 1 |
| 3 |
=
| 1 |
| 3 |
(3)20-(3.84+1.21)×0.4,
=20-5.05×0.4,
=20-2.02,
=17.98;
(4)35÷[(
| 11 |
| 6 |
| 2 |
| 3 |
=35÷[
| 7 |
| 6 |
=35÷7,
=5.
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