x(1+40%)85%=x+380
问题描述:
x(1+40%)85%=x+380
答
x(1+40%)85%=x+380
1.4*0.85x=x+380
( 1.19-1)x=380
0.19x=380
x=380/0.19
=2000
祝你学业进步!