题目内容
用简便方法计算.
(1)
-0.8+
(2)2.5×4.4
(3)14
-7.75-2
(4)3.76×5
+3.76+3
×3.76.
(1)
| 5 |
| 11 |
| 6 |
| 11 |
(2)2.5×4.4
(3)14
| 6 |
| 13 |
| 1 |
| 4 |
(4)3.76×5
| 4 |
| 7 |
| 3 |
| 7 |
(1)
-0.8+
,
=
+
-0.8,
=1-0.8,
=0.2;
(2)2.5×4.4,
=2.5×4+2.5×0.4,
=10+1,
=11;
(3)14
-7.75-2
,
14
-(7.75+2.25),
=14
-10,
=4
;
(4)3.76×5
+3.76+3
×3.76,
=3.76×(5
+3
+1),
=3.76×10,
=37.6.
| 5 |
| 11 |
| 6 |
| 11 |
=
| 5 |
| 11 |
| 6 |
| 11 |
=1-0.8,
=0.2;
(2)2.5×4.4,
=2.5×4+2.5×0.4,
=10+1,
=11;
(3)14
| 6 |
| 13 |
| 1 |
| 4 |
14
| 6 |
| 13 |
=14
| 6 |
| 13 |
=4
| 6 |
| 13 |
(4)3.76×5
| 4 |
| 7 |
| 3 |
| 7 |
=3.76×(5
| 4 |
| 7 |
| 3 |
| 7 |
=3.76×10,
=37.6.
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