以知X+Y=4,X*2+Y*2=10,求X*3+Y*3,X*4+Y*4的值

以知X+Y=4,X*2+Y*2=10,求X*3+Y*3,X*4+Y*4的值 以知|x-4|+|y+2|=0,求2x-|y|的值 以知x,y满足1/2[x-y]+[1-y]=0,求7x-3y的值 以知2x+y+t=8,试求F(x,y,t)=5(x-y)^2+4y^2+3t^2最小值 以知:x^3-3y^2=2xy,求x+2y/x-y=? 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 以知:x^2+y^2=16,求x+y的最大值和最小值 若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y= (答对追加200分)1.以知实数X,Y满足,(开方3X+4)+Y的平方-6Y+9=0 若 AXY-3X=Y.求实数A的值.2.若A满足开放X+2Y-A+(开方2X-3Y+2A)=(开方10-X-Y)*(开方X+Y)-10 求A值.3.以知一个三角形的三边长为X.Y.Z,且满足 X的平方+ 2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x+y=4,x^2+y^2=10,求(x-y)^2 x^2+4y^2-6x+4y=-10求x,y的值 x²+4y²-2x+12y+10=0求X,Y值 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 就是已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y /4y就是除以4y