0.72÷0.9=
7.2
7.2
÷9,8.6×1.7=
0.086
0.086
×170.
分析:(1)根據(jù)除法商不變的規(guī)律求解;
(2)根據(jù)積不變的規(guī)律求解;
解答:解:(1)0.72÷0.9=(0.72×10)÷(0.9×10)=7.2÷9;

(2)8.6×1.7=(8.8÷100)×(1.7×100)=0.086×170.
故答案為:7.2,0.086.
點(diǎn)評(píng):本題考查了商不變規(guī)律和積不變規(guī)律,關(guān)鍵看清楚小數(shù)點(diǎn)是如何移動(dòng)的.
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