x/80+5=x/60 怎么解
问题描述:
x/80+5=x/60 怎么解
答
x/80 ×240+5×240=x/60×240
3x+1200=4x
x=1200
答
两边同时X240,得3X+1200=4X ;X=1200
答
x/80+5=x/60
1/60x - 1/80x = 5
1/240x = 5
x = 5 ÷ 1/240
x = 5 × 240
x = 1200