题目内容
计算题.
(1)37.5%×40+
| (2)
| ||||||
(3)
| (4)4.5÷[(10-2.5)×2]. |
(1)37.5%×40+
×40,
=(37.5%+
)×40,
=0.75×40,
=30;
(2)
×22%+0.78×40%,
=0.4×22%+0.78×0.4,
=0.4×(22%+0.78),
=0.4×1,
=0.4;
(3)
÷17+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)4.5÷[(10-2.5)×2],
=4.5÷[7.5×2],
=4.5÷15,
=0.3.
| 3 |
| 8 |
=(37.5%+
| 3 |
| 8 |
=0.75×40,
=30;
(2)
| 2 |
| 5 |
=0.4×22%+0.78×0.4,
=0.4×(22%+0.78),
=0.4×1,
=0.4;
(3)
| 12 |
| 25 |
| 13 |
| 25 |
| 1 |
| 17 |
=
| 12 |
| 25 |
| 1 |
| 17 |
| 13 |
| 25 |
| 1 |
| 17 |
=(
| 12 |
| 25 |
| 13 |
| 25 |
| 1 |
| 17 |
=1×
| 1 |
| 17 |
=
| 1 |
| 17 |
(4)4.5÷[(10-2.5)×2],
=4.5÷[7.5×2],
=4.5÷15,
=0.3.
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