3x+2y=6 4x-2y=8 谁教教~
、问题是这样的 x²+y²+z²-2x+4y-6y+14=0,求x+y+z的值谁来教教
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
解方程组 x-y/3-x+y/4=2 x-y/6-x+y/8=3
5x+6y+3x-4y+3-x+x =5x+3x-x+x+6y-4y+3 =8x=2y+3 谁能告诉我这题合并同类项的解
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
9y=3x-(x-1),4(x+y)-(2x+4)=8y
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算