Question

abcdef乘以5等于fabcde.,问abcdef各是几?

Answer 1

设abcde=x

5*(10*x+f)=100000*f+x

50x+5f=100000f+x

49x=99995f

7x=14285f

7x=(14280+5)f

x=14280f/7+5f/7

x=2040f+5f/7

f=7,

x=2040*7+5*7/7=14280+5=14285

abcdef=142857

142857*5=714285