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脱式计算.2.5+(6.2%2.6)+1.8119%(42.5+1.6+3.6...

①2.5+(6.2-2.6)+1.8=2.5+3.6+1.87.9;②119-(42.5+1.6+3.6)119-47.7=71.3;③7.24+(3.1-3.09)=7.24+0.01=7.25;④[0.15+(2.4-1.8)]×20=[0.15+0.6]×20=0.75×20=15;⑤0.78×[12-(1.45+3.8)]=0.78×[12-5.25]=0.78×6.75=5.265;⑥9.07-22.78÷3....

(1)2.5:57=x:6, 57x=2.5×6, 57x×75=15×75, x=21;(2)11.6-1.75x=1.6,11.6-1.75x+1.75x-1.6=1.6+1.75x-1.6, 10=1.75x, 1.75x=10, 1.75x÷1.75=10÷1.75, x=407.

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