0.45(10-(0.2+6.37÷0.7))×0.5巧算

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0.45(10-(0.2+6.37÷0.7))×0.5巧算0.45(10-(0.2+6.37÷0.7))×0.5巧算0.45(10-(0.2+6.37÷0.7))×0.5巧算0.45+(10-(0.2

0.45(10-(0.2+6.37÷0.7))×0.5巧算
0.45(10-(0.2+6.37÷0.7))×0.5巧算

0.45(10-(0.2+6.37÷0.7))×0.5巧算
0.45+(10-(0.2+9.1))×0.5
=0.45+(10-9.3)×0.5
=0.45+0.7×0.5
=0.45+0.35
=0.8