题目内容
用适当的方法计算.
3.5×
| 8
|
|
(1)3.5×
+5.5×80%+0.8,
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
(2)8
÷[7.8+
×(2.75+1.25)],
=8
÷[7.8+
×4],
=8
÷[7.8+1],
=8.8÷8.8,
=1;
(3)
÷[(
-
)÷
],
=
÷[
÷
],
=
÷
,
=
.
| 4 |
| 5 |
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
(2)8
| 4 |
| 5 |
| 1 |
| 4 |
=8
| 4 |
| 5 |
| 1 |
| 4 |
=8
| 4 |
| 5 |
=8.8÷8.8,
=1;
(3)
| 4 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
| 7 |
| 10 |
=
| 4 |
| 5 |
| 7 |
| 20 |
| 7 |
| 10 |
=
| 4 |
| 5 |
| 1 |
| 2 |
=
| 8 |
| 5 |
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