8.4÷5×（5×2）=________．

16.8
分析：本題可以根據(jù)乘法交換律及結(jié)合律進(jìn)行計(jì)算．
解答：8.4÷5×（5×2）
=8.4×5÷5×2，
=8.4×（5÷5）×2，
=8.4×1×2，
=16.8．
故答案為：16.8．
點(diǎn)評：完成四則混合運(yùn)算題目時(shí)要認(rèn)真分析式中數(shù)據(jù)，能利用運(yùn)算定律簡算的要進(jìn)行簡算．
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180÷60=12×25=0÷90=
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