脱式计算(能用简便方法的用简便方法计算)2.5×(10+0.1)4.5×7.3+2.7×4.50.125×8×25×0.4 &nbs
答案:1 悬赏:50 手机版
解决时间 2021-02-01 15:49
- 提问者网友:杀手的诗
- 2021-02-01 08:09
脱式计算(能用简便方法的用简便方法计算)2.5×(10+0.1)4.5×7.3+2.7×4.50.125×8×25×0.4 &nbs
最佳答案
- 五星知识达人网友:千夜
- 2021-02-01 08:29
①2.5×(10+0.1)
=2.5×10+2.5×0.1
=25+0.25
=25.25
②4.5×7.3+2.7×4.5
=4.5×(7.3+2.7)
=4.5×10
=45
③0.125×8×25×0.4
=(0.125×8)×(25×0.4)
=1×10
=10
④10.2×4.5
=(10+0.2)×4.5
=10×4.5+0.2×4.5
=45+0.9
=45.9
=2.5×10+2.5×0.1
=25+0.25
=25.25
②4.5×7.3+2.7×4.5
=4.5×(7.3+2.7)
=4.5×10
=45
③0.125×8×25×0.4
=(0.125×8)×(25×0.4)
=1×10
=10
④10.2×4.5
=(10+0.2)×4.5
=10×4.5+0.2×4.5
=45+0.9
=45.9
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