解方程:x-1/5x=32 1/3x+1/4x=7/15 (8/9-5/12)x=34

问题描述:

解方程:x-1/5x=32 1/3x+1/4x=7/15 (8/9-5/12)x=34
我上面写的是3道x-1/5x=32 1/3x+1/4x=7/15 (8/9-5/12)x=34

(1)x-1/5x=32
:(1-1/5)x=32
4/5x=32
x=40
(2) 1/3x+1/4x=7/15
( 1/3+1/4)x=7/15
7/12 x=7/15
x=4/5
(3)(8/9-5/12)x=34
17/36 x=34
x=72