0.2x+3=0.25(84-x)怎么解,
问题描述:
0.2x+3=0.25(84-x)怎么解,
答
0.2x+3=0.25(84-x)
0.2x+3=21-0.25x
0.2x+0.25x=21-3
0.45x=18
x=18/0.45
x=40