解方程组 (x+y)/6 -(x-y)/4=0 (2x-y)/3+(x-2y)/2=9 x= y=咦题目格式……(x+y)/6 -_数学解答

解方程组 (x+y)/6 -(x-y)/4=0 (2x-y)/3+(x-2y)/2=9 x= y=
咦题目格式……
(x+y)/6 -(x-y)/4=0
(2x-y)/3+(x-2y)/2=9
x= y=

人气：390 ℃　时间：2019-12-24 22:44:13

解答

(x+y)/6 -(x-y)/4=0 即5y-x=0即35y-7x=0
(2x-y)/3+(x-2y)/2=9即7x-8y=54
两个式子加起来 27y=54
y=2 x=10