2x-7y=8 3x-8y=10 x=___ y____
2x-7y=8 3x-8y=10 x=___ y____
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
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
已知3x+2y=5,则8^x*4^y=___
已知二元一次方程组{2x+y=7;x+2y=8,则x-y=____,x+y=___
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
若5x+3y=3x+4y=x+2y+6,则x+y=___
2x-y=7,3x+y=8
已知2X-Y=-3,则(Y-2X)-6X+3Y+7的值为___
9y=3x-(x-1),4(x+y)-(2x+4)=8y