Y=X+0.5/0.25(19.5-X)*100%化简等于几?

已知x>=0,y>=0,求证0.5(x+y)^2+0.25(x+y)>=x√y+y√x x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = y=x(x 1.（x+0.5y）（x-0.5y）（x平方-0.25y平方）2.（x+0.5)平方-（x-0.5）（x+0.5）=0.5 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}] （x+3y)²-2（x-y)（x+y)+(x+y)²其x=0.5,y=-2 x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 x+y/0.75 +x/0.5=8 2x/0.25+1-2y/0.125=8 x+x+y=8.3 其中x-y=0.25 那x是多少,y是多少? x+x+y=8.3 其中x-y=0.25 那么X是多少,Y是多少? x+x+x+x+y+y+y=56 解下列方程组：1、0.25x-0.5y=2 2、二分之x+y+二分之x-y=6 0.4x+0.25y=20 4（x+y)-5(x-y)=2 A={（x,y)|y>=0.5|x-2|},B={(x,y)|y matlab画二元函数图像z = (x/(x+y) + 1.96*1.96/(2*(x+y)) - 1.96 * ((x/(x+y)*(1-x/(x+y))+1.96*1.96/(4*(x+y)))/(x+y))^0.5)/(1+1.96*1.96/(x+y))该怎么画 已知x+y=-4试计算多项式0.5(x+y)+4(x-y)-3(x-y)-1.5(x+y)-x+y的值 Y=X+0.5/0.25(19.5-X)*100%化简等于几? y={x+[x+(x)^0.5]^0.5}^0.5求导