x 2y=24所以y=log0.5(2x2-3x 1)A=｛x|x2-3x 2=0｝所以0
亲爱的网友：u=u2(x) u2(y) u2(z)y=cosx=sin（x 丌/2)
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求u=u2(x) u2(y) u2(z)y=cosx=sin（x 丌/2)
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跪求u=u2(x) u2(y) u2(z)y=cosx=sin（x 丌/2)
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亲爱的网友：u=u2(x) u2(y) u2(z)2y-x=4
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亲爱的网友：u=u2(x) u2(y) u2(z)x=1 rcosA,y=-1 rsinA,
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亲爱的网友：u=u2(x) u2(y) u2(z)AB BC CA)/2=0
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x+y+z+u=4,x+y-z=-2,x-y+z-u=0,x+y-z+u=2.
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亲爱的网友：u=u2(x) u2(y) u2(z)1/2×2/3×3/4×4/5×…×98/99×99/100
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u=(x-y)^z,z=x^2+y^2,求u对x的偏导数
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设函数u=f(r),r=√(x^2+y^2+z^2),则э^2u/эx^2+э^2u/эy^2+э^2u/эz^2=
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亲爱的网友：B= m=3y=cosx=sin（x 丌/2)