數(shù)學(xué)公式×8.5+數(shù)學(xué)公式×7.5)÷15

解:(×8.5+×7.5)÷15,
=(7.5×8.5+11.5×7.5)÷15,
=[(8.5+11.5)×7.5]÷15,
=[20×7.5]÷15,
=150÷15,
=10.
分析:先把小括號(hào)里面的運(yùn)算運(yùn)用乘法分配律簡(jiǎn)算,再計(jì)算括號(hào)外的除法.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.
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