题目内容
| 计算下面各题,能用简便算法的用简便算法 (1)12.25-3.1+0.85-6.17 | (2)(1.9-1.9×0.9)÷(3.8-2.8) |
| (3)2.65×1.7+1.35×1.7 | (4)0.125×13.8×32×0.25. |
(1)12.25-3.1+0.85-6.17
=12.25+0.85-3.1-6.17
=13.1-3.1-6.17
=10-6.17
=3.83;
(2)(1.9-1.9×0.9)÷(3.8-2.8)
=(1.9-1.71)÷(3.8-2.8)
=0.19÷1
=0.19;
(3)2.65×1.7+1.35×1.7
=(2.65+1.35)×1.7
=4×1.7
=6.8;
(4)0.125×13.8×32×0.25
=0.125×8×(4×0.25)×13.8
=1×1×13.8
=13.8.
=12.25+0.85-3.1-6.17
=13.1-3.1-6.17
=10-6.17
=3.83;
(2)(1.9-1.9×0.9)÷(3.8-2.8)
=(1.9-1.71)÷(3.8-2.8)
=0.19÷1
=0.19;
(3)2.65×1.7+1.35×1.7
=(2.65+1.35)×1.7
=4×1.7
=6.8;
(4)0.125×13.8×32×0.25
=0.125×8×(4×0.25)×13.8
=1×1×13.8
=13.8.
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