z=x的y次方×y的x次方,对x求偏导数

因为1998=18x111=2x9x111=2的1次方x3的2次方x111的1次方所以x=1y=2z=1X的2008次方=1Y的2008次方=2的2008次方Z的2008次方=1

d(X^Y)/dy=X^Y*lnXU=X^(Y^Z)U对Z求偏导=[X^(Y^Z)对Y^Z求偏导]*(Y^Z对Z求偏导)=[X^(Y^Z)*lnX]*(Y^Z*lnY)=lnX*lnY*Y^Z*X^(

2^x=32^y=6=2×3=2×2^x=2^(x+1)y=x+1>x2^z=12=2×6=2×2^y=2^(y+1)z=y+1>yx

(太麻烦拉,给点分啊!)设v=x*x-y*y,u=exp{xy}那么dv/dx=2x(这里应该用偏导符号,代替一下),dv/dy=2y,du/dx=y*exp{xy},du/dy=x*exp{xy}那

x^20*y^15*z^5=64=>(x^4*y^3*z^1)^5=64=>s=x^8*y^6*z^2=64^(2/5)=2^(7*2/5)=2^(14/5)

(x-y)(z+y-x+y+2y)÷4y=(x-y)(z-x+4y)÷4y{(x+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y=(x-y)(x+y-x+y+2y)÷4y=(x-y)(4

x-2的绝对值+y的平方+根号下x+y-2z=4y-4化简为x-2的绝对值+(y-2)^2+√（x+y-2z)=0所以x-2=0,y-2=0,x+y-2z=0即x=2,y=2,z=2所以z的x次方的y

原式=（x+y-z)^3n(x+y-z)^2n(x-y-z)^5n=(x+y-z)^5n(x-y-z)^5n=[（x-z)^2-y^2]^5n^后面的是上标~

(xy的2次方z的3次方)²×(-2x²y)³=x²y的4次方z的6次方x（-8x的6次方y³）=-8x的10次方y³z的6次方

x^20*y^15*z^5=32x^40*y^30*z^10=1024x^8*y^6*z^2=五次根号1024=4

2的x次方=3,4的y次方=5,8的z次方=7,求8的x-2y+z的值4的y次方=5=2的2y次方8的z次方=7=3的3z次方8的x-2y+z=2的（3x-6y+3z）次方=（2的x次方）³

10800=108*100=4*27*4*25=16*27*25=2^4*3^3*5^22^X*3^Y*5^Z=10800,XYZ为正整数X=4,Y=3,Z=2(X+Z-5)^(-Y)=(4+2-5)

z^x=y^z,隐函数F(x,y,z)=z^x-y^zFx=lnz*z^xFy=-zy^(z-1)Fz=x*z^(x-1)-lny*y^zбz/бx=-Fx/Fz=-(lnz*z^x)/(x*z^(x

没看到你说到z啊?这个题目怎么做呢?

设3^x=4^y=6^z=k.(k>1)x=log3(k)y=log4(k)z=log6(k)1/z-1/x=logk(6)-logk(3)=logk(2)1/(2y)=1/2*logk(4)=log

z=x^(x^y)Lnz=x^y*Lnx=>Ln(Lnz)=Ln(Lnx)+y*Lnx.(*)(*)两边关于x求偏导：左＝(1/(Lnz))*(1/z)*(dz/dx)右＝(1/Lnx)*(1/x)+

设2的x次方=5的y次方=10的z次方=M则log2(M)=x,log5(M)=y,log10(M)=zlogM(2)=1/x,logM(5)=1/y,logM(10)=1/z因为logM(2)+lo

x³-xyz+x²y-x²z=(x³+x²y)-(xyz+x²z)=x²(x+y)-xz(y+x)=x(x+y)(x+z).

x^4＋y^4＋z^4－2x^2y^2－2x^2z^2－2y^2z^2＝(x^4＋y^4－2x^2y^2)＋z^4－2x^2z^2－2y^2z^2＝(x^2－y^2)^2－2(x^2－y^2)z^2＋

^表示次方(25x的2次方y的3次方z-10x的3次方y的2次方)÷(5x的2次方y)×y=(25x^2y^3z-10x^3y^2)÷(5x^2y)×y=(25÷5)x^(2-2)y^(3-1+1)z