(X+3)/2+(Y-5)/3=-1 (X-3)/2+(2Y-7)/3=-4 解方程组
问题描述:
(X+3)/2+(Y-5)/3=-1 (X-3)/2+(2Y-7)/3=-4 解方程组
答
(X+3)/2+(Y-5)/3=-1
(X-3)/2+(2Y-7)/3=-4
相减得:y=20,x=-9
答
x = -3, y = 2
答
(X+3)/2+(Y-5)/3=-1 (1)(X-3)/2+(2Y-7)/3=-4 (2)(1)变形得:x/2+3/2+y/3-5/3=-1 x/2+y/3=-1-3/2+5/3=-5/6 (3)(2)变形得:x/2-3/2+2y/3-7/3=-4 x/2+2y/3=-4+3/2+7/3=-1/6 (4)(4)-(3)得:y/3=4/6 y=4/...
答
我不会 哈哈