12Xx25%+(3200-12X)x20%=700
问题描述:
12Xx25%+(3200-12X)x20%=700
答
12Xx25%+(3200-12X)x20%=700
12Xx5+(3200-12X)x4=700×20
60x+12800-48x=14000
12x=1200
x=100