[19+20.14×(1.9-1又10分之9)0.95]÷0.38

[19+20.14×(1.9-1又10分之9)0.95]÷0.38

[19+20.14×(1.9-1又10分之9)0.95]÷0.38
=[19+20.14×(1.9-1.9)0.95]÷0.38
=[19+20.14×0×0.95]÷0.38
=[19+0]÷0.38
=19÷0.38
=50
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