10(8-y)+6y=56
10(8-y)+6y=56
1.5y+8y-6y=2y-3
先化简,在求值:6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y=
8y+12=8-8y-5y+10
2.5y+10y-6y=15-21.5
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
(3y-1)/4-1=(5y-7)/6 9y-3-3=10y-14 9y-10y=-14+3+3 -y=-8 y=8
解方程:(y+4)/5+y+6=(y+8)/2-(y+4)/3
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+2
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)