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7.2+28.7÷0.7(递等式计算)

解: 7.2×63+28×6.3 =7.2×63+2.8×63 =(7.2+2.8)×63 =...

①28.49÷7.4×0.32=3.85×0.32=1.232;②(514÷1.25+112)×13...

(1)72-3×8÷6=72-24÷6=72-4=68;(2)36.5×(28-5)=36.5×23...

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