已知:√X+√(Y-1)+√(Z-2)=1/2(X+Y+Z),求X,Y,Z的值
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设u = √x =>x = u^2
v = √y-1 =>y = v^2+1
w = √z-2 =>z = w^2+2
所以2(u+v+w) = u^2+w^2+v^2+3
所以
(u-1)^2+(v-1)^2+(w-1)^2 = 0
所以u = v = w =1
所以
x = 1
y = 2
z = 3
v = √y-1 =>y = v^2+1
w = √z-2 =>z = w^2+2
所以2(u+v+w) = u^2+w^2+v^2+3
所以
(u-1)^2+(v-1)^2+(w-1)^2 = 0
所以u = v = w =1
所以
x = 1
y = 2
z = 3
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