已知4(x+0.5)^2+│y+1│=0,求4x^2y-2/3xy^2+4x^2y+2-8x^2y+1/2xy^2的值

已知(3X-2Y+1)的平方+│4X-3Y-3│=0,求X,Y 已知4(x+0.5)^2+│y+1│=0,求4x^2y-2/3xy^2+4x^2y+2-8x^2y+1/2xy^2的值 已知4(x+0.5)^2+│y+1│=0,求4x^2y-2/3xy^2+4x^2y+2-8x^2y+1/2xy^2的值 已知实数x,y满足√(2x-3y-1)+│x-2y+2│=0,求2x-5分之1y的平方根 mathematica软件,已知y[x],Y=f1(x),X(x)=f2(x),如何plot Y[X]?y[x_] := x + 9.81/2*x*xk=1X[x] = x - k*y'[x]/(1 + (y'[x])^2)^0.5Y[x] = y[x] + k/(1 + (y'[x])^2)^0.5Plot[{y[x],Y[X],},{x,0,2}] 已知:x-2y+3=0 求x^2-(4y+1)x+4y^2+2y 已知有理数X,Y满足1/2│X-Y│+┃Y-1/2┃=0,求3X-7Y的值. 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知有理数x,y满足1/2│x-2y│=-2│x-4│,求4x∧2-3y 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知我x>=0,y>=0,求证:1/2(x+y)^2+1/4(x+y)>=x根号下y+y根号下x 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知,x＞0,y＞0,x≠y,且x+y=x^2+y^2+xy,求证：1小于x+y小于4/3 已知x求^2+y^2-6x-8y+25=0求1/x-y /x+y/x^4-y^4 已知x,y是有理数,且│x+1│+(3-4y-x)=0,求x,y的值 已知√2x+4y-5 + │2x-3│ = 0.（1）求x,y的值.（2）求x+y的平方根. 已知|X-3Y-1|+(X+Y)^=4XY,求X/Y的值另外还有道：已知X^2+Y^2+6X-4Y+13=0,①求X,Y的值②X^2-Y^2的值已知|X-3Y-1|+(X+Y)^2=4XY，求X/Y的值 已知|3x+y-0.5|+(x+2y+1.5)^2=0,求代数式（x-y)(x-2y)-3x(1/3x-y)+(2x+y)(2x-y) 快.