5X+45=7X+3 12Xx25%+(3200-12X)x20%=700 (580-x)+[600-(x+272)]=444

问题描述:

5X+45=7X+3 12Xx25%+(3200-12X)x20%=700 (580-x)+[600-(x+272)]=444

5X+45=7X+3===》2x=42====》x=21
12Xx25%+(3200-12X)x20%=700
4x+640-2.4x=700
1.6x=60
x=37.5
(580-x)+[600-(x+272)]=444
580-x+600-x-272=444
464=2x
x=232