脱式计算:(能简算的要写简算过程)13.7×0.25×8;[12.7-(7.25+4.5)]×5.2;7
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解决时间 2021-03-30 01:36
- 提问者网友:ミ烙印ゝ
- 2021-03-29 12:58
脱式计算:(能简算的要写简算过程)13.7×0.25×8;[12.7-(7.25+4.5)]×5.2;7
最佳答案
- 五星知识达人网友:人间朝暮
- 2021-03-29 13:33
(1)13.7×0.25×8
=13.7×(0.25×8)
=13.7×2
=27.4;
(2)[12.7-(7.25+4.5)]×5.2
=[12.7-11.75]×5.2
=0.95×5.2
=4.94;
(3)799×99
=799×(100-1)
=799×100-799
=79900-(800-1)
=79900-800+1
=79101.
(4)1.6×(2.25+27.75÷1.5)
=1.6×(2.25+18.5)
=1.6×20.75
=33.2.
=13.7×(0.25×8)
=13.7×2
=27.4;
(2)[12.7-(7.25+4.5)]×5.2
=[12.7-11.75]×5.2
=0.95×5.2
=4.94;
(3)799×99
=799×(100-1)
=799×100-799
=79900-(800-1)
=79900-800+1
=79101.
(4)1.6×(2.25+27.75÷1.5)
=1.6×(2.25+18.5)
=1.6×20.75
=33.2.
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