x/2-y/3=7,2x+y=14
1个回答
x/2-y/3=7,3x-2y=42
2x+y=14,4x+2y=28
3x+4x=42+28
7x=70
x=10
2x10+y=14
y=-6
相关问题
一.分解因式1.x^2(x-y)+(y-x)2.(x+y)^2-14(x+y)+49 3.7x^n+1-14x^n+7x
x+2y+3x=15,x-y+7x=20,x+3y+2z=14
6x^2-7xy -3y^2+14x+y+a=(2x-3y+b)(.x+y+1)
(1){x+2y+3z=14① {2x+y+z=7②{3x+y+2z=11③
x+2y+3z=14 2x+y+z=7 3x+y+2z=11 求x y z
解方程组:7X-3Y=-4 X+2Y=14
1.2x+1.3y=14 2.3x-0.7y=1
x/2+y/7=13/14,x+y=?
x/2+y/7=13/14,x+y=?
已知x+y=4,x2+y2=14,那么x7+y7=______.