19x+4y=15,19x-5y=24
联立方程 1.{3X+7Y=15 2X-5Y=-19 24X-3Y=0 2X+Y=10 9X+10Y=-2 6X+Y+4
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
x+x+x=15,x+y+y=19,求y-x等于几
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
已知x+y=-5,x*x*x+y*y=19,求xy和(x-y)的值
{x-y=4 {3x+4y=19
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
已知:4x = 5y,求(x+y) :y
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
x-y+5x-4x= ?
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?