40%X + (40%X - 24 ) + 56 = X 怎么解?
问题描述:
40%X + (40%X - 24 ) + 56 = X 怎么解?
答
40%X + (40%X - 24 ) + 56 = X
0.8X +32=X
0.2X=32
X=160