180-X+1/4X=180-X+1/5(180-X)怎么解?

问题描述:

180-X+1/4X=180-X+1/5(180-X)怎么解?

x是在分母还是分子,如果是分子的话:
180 - 3x/4 = 180 - x +36-x/5
9x/20 = 36
x = 80

1/4X=1/5(180-X)
5X=4(180-X)
9X=720
X=80

180-X+1/4X=180-X+1/5(180-X)
两边同乘20
3600-20X+5X=3600-20X+4(180-X)
3600-20X+5X=3600-20X+720-4X
3600-15X=3600+720-24X
24X-15X=3600+720-3600
9X=720
X=80