分析:觀察題干,已知兩個因數(shù)分別是124和24,積是2976;
(1)124→12.4縮小了10倍,24→0.24縮小了100,積就縮小1000倍是2.976;
(2)124→0.124縮小了1000倍,24→240擴大10倍,則積縮小100倍是29.76;
(3)先根據(jù)給出的乘法算式寫出除法算式即2976÷24=124,被除數(shù)2976→2.976縮小了1000倍,商124→1.24縮小了100倍,除數(shù)應縮小10,是2.4.
解答:解:12.4×0.24=2.976,
240×0.124=29.76,
2.976÷2.4=1.24,
故答案為:2.976,29.76,2.4.
點評:本題由積的變化規(guī)律和商的變化規(guī)律來求解,注意看清楚因數(shù)是怎樣變化的,或者商和被除數(shù)是怎樣變化的.