(5/2)x+(2/3)y=-10x/3-y/9=1(x-y)/5-(x+y)/2=-1/10(x-y)/7-(x+y)/6=1/_数学解答

(5/2)x+(2/3)y=-10
x/3-y/9=1
(x-y)/5-(x+y)/2=-1/10
(x-y)/7-(x+y)/6=1/2

人气：414 ℃　时间：2020-04-02 16:33:57

解答

(5/2)x+(2/3)y=-10 --(1) x/3-y/9=1 --(2) 由（2）得x=3+1/3y 代人（1）有2/5(3+1/3y)+2/3y=-10 y=-35/3 代入x=3+1/3y x=-8/9 所以x=-8/9 y=-35/3第二题上面有答案,思路可以把x+y、x-y看分别看做一个整体...