题目内容
根据65×39=2535,在下面的括号里填上合适的数.你能想出几种填法?
25.35=
=
=
=
2.535=
=
=
=
25.35=
6.5
6.5
×3.9
3.9
=
0.65
0.65
×39
39
=
0.065
0.065
×390
390
=
0.0065
0.0065
×3900
3900
2.535=
6.5
6.5
×0.39
0.39
=
0.65
0.65
×3.9
3.9
=
0.065
0.065
×39
39
=
65
65
×0.039
0.039
.分析:积的变化规律:一个因数不变,另一个因数扩大或缩小几倍(0除外),积也就扩大或缩小相同的倍数;据此解答.
解答:解:25.35=6.5×3.9
=0.65×39
=0.065×390
=0.0065×3900
2.535=6.5×0.39
=0.65×3.9
=0.065×39
=65×0.039.
故答案为:6.5,3.9,0.65,39,0.065,390,0.0065,3900,6.5,0.39,0.65,3.9,0.065,39,65,0.039.
=0.65×39
=0.065×390
=0.0065×3900
2.535=6.5×0.39
=0.65×3.9
=0.065×39
=65×0.039.
故答案为:6.5,3.9,0.65,39,0.065,390,0.0065,3900,6.5,0.39,0.65,3.9,0.065,39,65,0.039.
点评:此题主要考查乘法算式中两个因数的变化引起积的变化规律.
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