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共找到 19862 与z 相关的结果,耗时10 ms
计算:(1)(x+y-
z
)(x+y+
z
).(2)(x+y-
z
)(x-y-
z
).(3)(x+y+
z
)(x-y-
z
).(4)(x+y-
z
)(x-y+
z
).
其他
已知复数
z
=x+yi(x,y∈R,i为虚数单位),且
z
2=8i,则
z
=()A.
z
=2+2iB.
z
=-2-2iC.
z
=-2+2i,或
z
=2-2iD.
z
=2+2i,或
z
=-2-2i
数学
已知想x,y,
z
满足2x+3y-
z
=0,且x-2y+
z
+0,那么x/
z
的值是已知x,y,
z
满足2x+3y-
z
=0,且x-2y+
z
=0,那么x/
z
的值是?
数学
x,y,
z
>0x^2/(1+x^2)+y^2/(1+y^2)+
z
^2/(1+
z
^2)=2求证x/(1+x^2)+y/(1+y^2)+
z
/(1+
z
^2)最大值我做了好久了,求帮帮忙x^2/(1+x^2)+y^2/(1+y^2)+
z
^2/(1+
z
^2)=2(a)所以:1/(
数学
1/(1+x^2)+1/(
1.x+y+
z
≠0且x/(y+
z
)=y/(x+y)=
z
/x+y,求x/(x+y+
z
)2.x+y+
z
=0,求证1/(x^2-y^2-
z
^2)+1/(y^2-
z
^2-x^2)+1/(
z
^2-x^2-y^2)=03.x^2-y^2=xy,求x^2y^-2+x^-2y^24.n
数学
^-2 y^2 4.n/m中
已知X、Y、Z满足方程组:4X-5Y-2Z=0X+4Y-3Z=0(1)用含有Z的代数式表示X,Y(2)求X:Y:Z已只三元一次方程组:ax+2by-
z
=05ax-3by+
z
=56x-5y+m
z
=11的解是X=1Y=-1,Z=3,求a、b、m的值X-Y-Z=5Y-Z-X=
数学
1Z-X-Y=-15
解下列方程组:(1){2x+y-
z
=2,x+2y-
z
=5,x-y+
z
=-5;(2){2x+y+
z
=15,x+2y-
z
=5,
z
-y+
z
=-5;(3){x:y:
z
=1:2:7,2x-y+3
z
=21.
数学
1、已知x+y+
z
=0求x(1/y+1/
z
)+y(1/x+1/
z
)+
z
(1/x+1/y)+62、x-(3/1-x)-(x^3-x^2+2)/x^2-11、已知x+y+
z
=0求x(1/y+1/
z
)+y(1/x+1/
z
)+
z
(1/x+1/y)+62、x-(3/1-x)-(x
数学
3/1-x)-(x^3-x^
三元一次方程要列方程(1)x+2y+
z
=82x-y-
z
=-33x+y-2
z
=-1(2)x+2y+3
z
=4y+
z
=13x+2
z
=3(3)x+y=7y+
z
=10
z
+x=9(4)x+2y+
z
=102x+3y-
z
=33x+2y+2
z
=17(1)x+2y=2009y+2
z
=201
数学
10z+2z=2011则x+
已知x、y、
z
满足2x-y-2
z
-6=0,已知x、y、
z
满足2x-y-2
z
-6=0,x2+y2+
z
2≤4,、则2x+y+
z
=?≤4,、则2x+y+
z
=?已知x、y、
z
满足2x-y-2
z
-6=0,x2+y2+
z
2≤4,、则2x+y+
z
=?已知x、y、
z
满足2x-y-2
z
-
其他
z-6=0,x2+y2 +z
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