题目内容
用简便方法计算.
(1)3.14×
| (2)1
| ||||||||
| (3)87.5×19-87.5×8-87.5 | (4)0.77×(
|
(1)3.14×
+3.14×
,
=3.14×(
+
),
=3.14×1,
=3.14;
(2)1
×25%+
×2.2,
=1.8×
+
×2.2,
=
×(1.8+2.2),
=
×4,
=1;
(3)87.5×19-87.5×8-87.5,
=87.5×19-87.5×8-87.5×1,
=87.5×(19-8-1),
=87.5×10,
=875;
(4)0.77×(
+
),
=0.77×
+0.77×
,
=0.66+0.14,
=0.8.
| 3 |
| 5 |
| 2 |
| 5 |
=3.14×(
| 3 |
| 5 |
| 2 |
| 5 |
=3.14×1,
=3.14;
(2)1
| 4 |
| 5 |
| 1 |
| 4 |
=1.8×
| 1 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=1;
(3)87.5×19-87.5×8-87.5,
=87.5×19-87.5×8-87.5×1,
=87.5×(19-8-1),
=87.5×10,
=875;
(4)0.77×(
| 6 |
| 7 |
| 2 |
| 11 |
=0.77×
| 6 |
| 7 |
| 2 |
| 11 |
=0.66+0.14,
=0.8.
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