将5.425425425''''''乘0.63写成小数形式.

5.425425425''''''乘0.63
=10*0.542542''''''*0.63
=0.542542''''''*6.3
=542/(1000-1)*6.3
=542/999*9*0.7
=542/111*7/10
=1897/555

是写成分数？
0.425425......=425/999
5.425425......=0.542542...×10=542/999×10=5420/999
5.425425425''''''×0.63
=5420/999×63/100
=(271*7)/(111*5)
=1897/555

不对呀，这本来就是小数。