题目内容
算一算.
2.6×3.7=26×
4.3×54=43×
8.2×0.19=0.82×
0.75×0.23=7.5×
2.6×3.7=26×
0.37
0.37
=0.26×37
37
;4.3×54=43×
5.4
5.4
=4300
4300
×0.054;8.2×0.19=0.82×
1.9
1.9
=82
82
×0.019;0.75×0.23=7.5×
0.023
0.023
=0.0075
0.0075
×23.分析:根据在一个乘法算式中,如果一个因数乘(或除以)几,另一个因数除以(或乘)相同的数(0除外),那么积不变,据此解答.
解答:解:2.6×3.7=26×0.37=0.26×37;
4.3×54=43×5.4=4300×0.054;
8.2×0.19=0.82×1.9=82×0.019;
0.75×0.23=7.5×0.023=0.075×23.
故答案为:0.37,37,5.4,4300,1.9,82,0.023,0.075.
4.3×54=43×5.4=4300×0.054;
8.2×0.19=0.82×1.9=82×0.019;
0.75×0.23=7.5×0.023=0.075×23.
故答案为:0.37,37,5.4,4300,1.9,82,0.023,0.075.
点评:本题主要考查了积不变规律.
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