20%=(X+4)/(50+X)x=?(50g*8%)+(x*40%)=(50+x)20%,x=?
问题描述:
20%=(X+4)/(50+X)
x=?
(50g*8%)+(x*40%)=(50+x)20%,x=?
答
20%=(X+4)/(50+X)
x=?
(50g*8%)+(x*40%)=(50+x)20%,x=?