在橫線里填上適當?shù)臄?shù),使等式成立:
(1)32.93÷3.7=______÷37
(2)3.84×2.4=______×24
(3)16.8×100=16.8÷______
(4)______÷0.11=28.6÷11.
解:(1)32.93÷3.7,
=(32.93×10)÷(3.7×10),
=329.3÷37;
(2)3.84×2.4,
=(0.384×10)×2.4,
=0.384×(10×2.4),
=0.384×24;
(3)16.8×100,
=16.8÷
,
=16.8÷0.01;
(4)0.286÷0.11,
=(0.286×100)÷(0.11×100),
=28.6÷11;
故答案為:329.3,0.384,0.01,0.286.
分析:(1)根據(jù)商不變性質(zhì):被除數(shù)和除數(shù)同時擴大10倍,商不變;
(2)把3.84×2.4轉(zhuǎn)化為(0.384×10)×2.4,然后運用乘法結(jié)合律進行解答;
(3)把乘法轉(zhuǎn)化為除法,然后把分數(shù)轉(zhuǎn)化為小數(shù);
(4)被除數(shù)和除數(shù)同時縮小100倍,商不變;
點評:明確商不變規(guī)律及商的變化規(guī)律是解答此題的關(guān)鍵;用到的知識點:乘法結(jié)合律.