1/x-1/9x-20=1怎么解

问题描述:

1/x-1/9x-20=1怎么解

解;1/x-1/9x-20=1
即9/9x-1/9x-20=1
即8/9x=21
8/21=9x
x=8/189

9/9x - 1/9x -20 = 1
8/9x - 20 =1
8/9x = 1 + 20
8/9x = 21
8 = 9x * 21
8 = 189x
x = 8 / 189