题目内容
脱式计算
(315+285)÷(315-255)
5-(
÷
+
)
(
+
-
)×36.
3.3×
+0.75×3.7+75%×3.
(315+285)÷(315-255)
5-(
| 6 |
| 7 |
| 3 |
| 14 |
| 6 |
| 13 |
(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
3.3×
| 3 |
| 4 |
(1)(315+285)÷(315-255)
=600÷60,
=10;
(2)5-(
÷
+
)
=5-(4+
),
=5-4
,
=
;
(3)(
+
-
)×36
=
×36+
×36-
×36,
=9+6-12,
=3;
(4)3.3×
+0.75×3.7+75%×3
=3.3×0.75+0.75×3.7+0.75×3,
=(3.3+3.7+3)×0.75,
=10×0.75,
=7.5.
=600÷60,
=10;
(2)5-(
| 6 |
| 7 |
| 3 |
| 14 |
| 6 |
| 13 |
=5-(4+
| 6 |
| 13 |
=5-4
| 6 |
| 13 |
=
| 7 |
| 13 |
(3)(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=9+6-12,
=3;
(4)3.3×
| 3 |
| 4 |
=3.3×0.75+0.75×3.7+0.75×3,
=(3.3+3.7+3)×0.75,
=10×0.75,
=7.5.
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