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脱式计算(能简算的要简算)5+0.45÷0.9-1.7575.36-24.9+24.64-25.171×40%+28×25+0.41÷〔(734+0.25)×0.125-12〕

题目详情
脱式计算(能简算的要简算)
5+0.45÷0.9-1.75 75.36-24.9+24.64-25.1
71×40%+28×
2
5
+0.4
1÷〔(7
3
4
+0.25)×0.125-
1
2
▼优质解答
答案和解析
(1)5+0.45÷0.9-1.75,
=5+0.5-1.75,
=3.75;

(2)75.36-24.9+24.64-25.1,
=(75.36+24.64)-(24.9+25.1),
=100-50,
=50;

(3)71×40%+28×
2
5
+0.4,
=71×0.4+28×0.4+0.4,
=(71+28+1)×0.4,
=100×0.4,
=40;

(4)1÷[(7
3
4
+0.25)×0.125-
1
2
],
=1÷[(7.75+0.25)×0.125-0.5],
=1÷[8×0.125-0.5],
=1÷0.5,
=2.