7.6÷0.42=
76
76
÷4.2=7600÷
420
420
分析:商不變性質(zhì):在除法里,被除數(shù)和除數(shù)同時擴大或縮小相同的倍數(shù)(0除外),商不變;據(jù)此解答.
解答:解:7.6÷0.42,
=(7.6×10)÷(0.42×10),
=76÷4.2;

7.6÷0.42,
=(7.6×1000)÷(0.42×1000),
=7600÷420;
故答案為:76,420.
點評:解答此題應(yīng)明確:只有被除數(shù)和除數(shù)同時擴大或縮小相同的倍數(shù)(0除外),商才不變.
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