（0.72×0.4×0.35）÷（0.9×0.2×7）

解：（0.72×0.4×0.35）÷（0.9×0.2×7），
=0.72×0.4×0.35÷0.9÷0.2÷7，
=（0.72÷0.9）×（0.4÷0.2）×（0.35÷7）
=0.8×2×0.05，
=0.8×（2×0.05），
=0.8×0.1，
=0.08．
分析：根據(jù)除以幾個(gè)數(shù)的乘積，等于分別除以這幾個(gè)數(shù)，去掉括號(hào)，再根據(jù)乘法交換律和結(jié)合律進(jìn)行簡算．
點(diǎn)評(píng)：四則運(yùn)算，先弄清運(yùn)算順序，然后再進(jìn)一步計(jì)算，能簡算的要簡算．
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