x-3分之x+y-3-x分之x-y=多少
x-3分之x+y-3-x分之x-y=多少
x-3分之x+y-3-x分之x-y
=(x-3)分之(x+y+x-y)
=(x-3)分之2x
f(x,y)=(ln(x-y))/(√y)的连续区域是?
f(x,y)=[ln(x-y)]/√y的连续区域是?
解:x-y>0,y>0;即由射线y=x与x轴正向所限制的区域,但不包含边界。
x y≤181 05x 10y≤510=[ky5-y10]^10=
1015不符合1510-11<x-y/11-xy
y=5/x,x和y成反比例,则y:( )=( ):( )
y=5/x,x和y成反比例,则y:(1 )=( 5):(x )
2y(x-y)^2-(y-x)^3过程具体!
(1)2y(x-y)^2-(y-x)^3
=2y(x-y)²+(x-y)³
=(x-y)²(2y+x-y)
=(x-y)²(x+y)
(2)(m-n)^3+m(n-m)^2-n(m-n)^2
=(m-n)³+m(m-n)²-n(m-n)²
=(m-n)²(m-n+m-n)
=2(m-n)³
x+y+Z=-1 4x-2y+3z=5 y-z=8
x+y+z=-1 (1)
4x-2y+3z=5 (2)
y-z=8-2x (3)
由(3)得
2x+y-z=8 (4)
(1)+(4)得
3x+2y=7 (5)
(4)×3+(2)得
10x+y=29 (6)
解方程组(5)(6)得
x=3
y=-1
把x=3,y=-1代入(1)得
z=-3
∴x=3
y=-1
z=-3
已知|X+2Y-4|+(Y-3)=0则2X+Y=?
x+2y-4=0;
y-3=0;
y=3;
x=-2;
2x+y=-4+3=-1;
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y=x分之10,那么x与y成( )比例,y:10=( : )
y=10/x,那么x与y成(反 )比例
y:10=1:x
(x+y)*e^(x+y)对y的积分怎么求
∫(x+y)*e^(x+y)dy
=∫(x+y)*e^(x+y)d(x+y)
=∫(x+y)de^(x+y)
=(x+y)e^(x+y)-∫e^(x+y)d(x+y)
=(x+y)e^(x+y)-e^(x+y)+C
X-Y=977,Y-Z=497,X,Y,Z各是多少
这么写就可以了: syms x y z; [x,y,z]=solve('x+2*y-z=27','x+z=3','x^2+3*y^2=28') 解: x = 45/4 - (563^(1/2)*i)/4 45/4 + (563^(1/2)*i)/4 y = 15/4 + (563^(1/2)*i)/4 15/4 - (563^(1/2)*i)/4 z = - 33/4 + (563^(1/2)*i)/4 - 33/4 - (563。