1 1 —x+0.4=—x-0.25 15 121 1—x+0.4=—x-0.2515 12
问题描述:
1 1 —x+0.4=—x-0.25 15 12
1 1
—x+0.4=—x-0.25
15 12
答
4x+24=5x-15
x=39