80/X + 220/(X+15)=6大神们帮帮忙

分类: 作业答案 • 2022-06-18 20:39:12

问题描述：

80/X + 220/(X+15)=6大神们帮帮忙
80/X + 220/(X+15)=6这道解方程怎么做?

答

80/X + 220/(X+15)=6 40/X + 110/(X+15)=3 40(x+15)+110x=3x(x+15) 40x+600+110x=3x+45x 3x-105x-600=0 x-35x-200=0 (x-40)(x+5)=0 x=40或x=-5