y=x根号1-x导-搜答案-百度作业网

原方程有意义则x+y-8≥0,8-x-y≥0,则8≥x+y≥8,则x+y=8则原方程为0=根号(3x-y-a)+根号(x-2y+a+3),则3x-y-a=0,x-2y+a+3=0又x+y=8联立解得x

∵1－x≥0,x≤1x－1≥0,x≥1∴x＝1y＝8∴√﹙x＋y﹚＝√﹙1＋8﹚＝3∴√﹙x＋y﹚的平方根是±√3.

[(2/3)x√(9x)+6x√(y/x)]+[y√(x/y)-x²√(1/x)]化简：原式=[(2/3)*3*x√x+6√(xy)]+[√(xy)-x√x]=2x√x+6√(xy)+√(x

Dx^y+x^-y=2根号2===>(x^y+x^-y)^2=8===>x^2y+x^-2y+2=8===>x^2y+x^-2y=6(x^y-x^-y)^2=x^2y+x^-2y-2=6-2=4==>

根号内必须大于等于0故有x-1≥0且1-x≥0即x≥1且x≤1所以x=1将x=1代回去得y=3然后将x,y代入所求式即可你的所求式表述不是很清楚,所以没办法帮你求了

y=xarcsin√[x/(1+x)]+arctan√(x-√2)-√x,求导dy/dx=arcsin√[x/(1+x)]+x{√[x/(1+x)]}′/√[1-x/(1+x)]+[√(x-√2)]′

题目的括号不太清楚如果是：根号3-X加上根号X-3在加1的话因为根号3-X>=0,根号X-3>=0,那么X值能等于3.那么Y就等于1.那么X+Y的算术平方根就是2

（根号y/根号x-根号y)-(根号y/根号x+根号y)=｛根号y（根号x+根号y）｝/（x-y）-｛根号y（根号x-根号y）｝/(x-y)=(y+y)/(x-y)因为x=2y所以原式=2y/y=2

x+y=02x+1=0x=-0.5y=0.52(x+5y)=2*(-0.5+2.5)=4平方根=±2

即x²+(y-1)²=0则x=0,y-1=0x=0,y=1所以原式=(0+1+3)/(1*(0+1))=4

原式=[(√x-√y)²+(√x+√y)²]/(√x+√y)(√x-√y)=(x+y-2√xy+x+y+2√xy)/(x-y)=2(x+y)/(x-y)=2(2+√3)/(2-√3

∵2x－6≥0,x≥33－x≥0.x≤3∴x＝3,y＝1x·√2x÷√﹙x/y﹚＝x·√2x·√﹙y/x﹚＝x·√2y＝3×√2×1＝3√2

√﹙x-y﹚=aa﹙a-1﹚=56a²-a-56=0﹙a-8﹚﹙a+7﹚=0a=8a=-7(舍去)x-y=64

y=√(2-x)+√(x-2)+1√(2-x)>=0x=0x>=2所以x=2,y=1x^y=2^1=2

原式=√y/(√2y-√y)-√y/(√2y+√y)=√y/[√y(√2-1)]-√y/[√y(√2+1)]=1/(√2-1)-1/(√2+1)=(√2+1)/(√2+1)(√2-1)-(√2-1)/

即xy=2²-(√3)=4-3=1原式=[(x+y)²-(x-y)²]/(x+y)(x-y)*[-(x²-y²)/x²y²]=(x

(注：表示根号)a有意义=>a>=0;y=(x-4)+(4-x)+1=>x-4>=0且4-x>=0=>x=4=>y=1=>x:y=4:1

[x+2√(x-1)]=[√(x-1)+1]^2[x-2√(x-1)]=[√(x-1)-1]^2x-1>=0x>=1y=√[x+2√(x-1)]+√[x-2√(x-1)]=√(x-1)+1+｜√(x-