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十五点七二减四点三八除以二点四怎么巧算

15.72-4.38÷2.4=15.72-(4.8-0.24-0.18)÷2.4=15.72-2+0.1+0.075=13.895

15.9-11.3+4.1-2.7 =(15.9+4.1)-(11.3+2.7) =20-14 =6

=15.4×102-15.4×2.5×0.8 =15.4×102-15.4×2 =15.4×(102-2) =15.4×100 =15400

12.85/0.125+2.15x8 =12.85/(1/8)+2.15x8 =12.85x8+2.15x8 =(12.85+2.15)x8 =15x8 =120

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