题目内容
| 用简便方法计算. (1)18.12-(5.3+1.12)= | (2)2×
| ||||||
| (3)2.5×3.2×1.25= | (4)41×101= |
(1)18.12-(5.3+1.12),
=18.12-1.12-5.3,
=17-5.3,
=11.7;
(2)2×
+
×5+
,
=(2+5+1)×
,
=8×
,
=2;
(3)2.5×3.2×1.25,
=(2.5×0.4)×(8×1.25),
=1×10,
=10;
(4)41×101,
=41×100+41×1,
=4100+41,
=4141.
=18.12-1.12-5.3,
=17-5.3,
=11.7;
(2)2×
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
=(2+5+1)×
| 1 |
| 4 |
=8×
| 1 |
| 4 |
=2;
(3)2.5×3.2×1.25,
=(2.5×0.4)×(8×1.25),
=1×10,
=10;
(4)41×101,
=41×100+41×1,
=4100+41,
=4141.
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