给得数点上小数点.
4.2×3.8=1596????
7.45×1.3=9685????
2.15×4.2=9030
2.06×13=2678????
5.3×4.2=2226?????
0.37×0.15=555.
网友回答
解:4.2×3.8=15.96,
7.45×1.3=9.685,
2.15×4.2=9.030,
2.06×13=26.78,
5.3×4.2=22.26,
0.37×0.15=0.0555.
解析分析:积的小数位数等于两个因数的小数位数和,据此解答.
点评:笔算两个小数相乘,所得的积的小数位数,等于两个因数中小数的位数之和.