一、 化简求值1 (x-2-(12)/(x+2))/(4-x)/(x+2)2【(x-y)²+(x+y)(x-y)】/2x ,x=3,y=1.53 (1+(3)/(x-1))/(x+2)/(x²-1)二、已知x=(a)/(b+c)y= (b)/(c+a) z= (在)/(a+b)且a+b+c≠0 求

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一、化简求值1(x-2-(12)/(x+2))/(4-x)/(x+2)2【(x-y)²+(x+y)(x-y)】/2x,x=3,y=1.53(1+(3)/(x-1))/(x+2)/(x

一、 化简求值1 (x-2-(12)/(x+2))/(4-x)/(x+2)2【(x-y)²+(x+y)(x-y)】/2x ,x=3,y=1.53 (1+(3)/(x-1))/(x+2)/(x²-1)二、已知x=(a)/(b+c)y= (b)/(c+a) z= (在)/(a+b)且a+b+c≠0 求
一、 化简求值
1 (x-2-(12)/(x+2))/(4-x)/(x+2)
2【(x-y)²+(x+y)(x-y)】/2x ,x=3,y=1.5
3 (1+(3)/(x-1))/(x+2)/(x²-1)
二、已知x=(a)/(b+c)y= (b)/(c+a) z= (在)/(a+b)且a+b+c≠0 求 (x)/(1+x)+(y)/(1+y)+(z)/(1+z)的值

一、 化简求值1 (x-2-(12)/(x+2))/(4-x)/(x+2)2【(x-y)²+(x+y)(x-y)】/2x ,x=3,y=1.53 (1+(3)/(x-1))/(x+2)/(x²-1)二、已知x=(a)/(b+c)y= (b)/(c+a) z= (在)/(a+b)且a+b+c≠0 求
1:x=2
y=16
2.x=13
y=18
3.x=24
y=6
(x)/(1+x)+(y)/(1+y)+(z)/(1+z)的值为4XY+2X的平方+2y的平方