8.4÷0.4=3.2×25=1÷數(shù)學(xué)公式=數(shù)學(xué)公式×25=
3+5÷6=18×（數(shù)學(xué)公式+數(shù)學(xué)公式）=數(shù)學(xué)公式×數(shù)學(xué)公式÷數(shù)學(xué)公式×數(shù)學(xué)公式=0.8×138+62×數(shù)學(xué)公式=

8.4÷0.4=21，3.2×25=80，1÷=9，×25=，
3+5÷6=3，18×（+）=27，×÷×=，0.8×138+62×=160．

分析：3.2×25先把3.2分解成8×0.4，然后運(yùn)用乘法結(jié)合律簡算；3+5÷6先算除法，再算加法；18×（+）運(yùn)用乘法分配律簡算；×÷×先把除法變成乘法，再運(yùn)用乘法結(jié)合律簡算；0.8×138+62×運(yùn)用乘法分配律簡算．
點(diǎn)評：本題考查了基本的計(jì)算，要注意分析式中數(shù)據(jù)，運(yùn)用合適的簡便方法計(jì)算．
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180÷60=12×25=0÷90=
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12×2.5=3.2÷1.6=3.5+3.5×3=
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