Please solve q 11?

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Answer 1 · 2018-04-01T17:54:08

The answer is #=1#

If #x+y=2z#

Then,

#x=2z-y#

Therefore,

#x/(x-z)=(2z-y)/(2z-y-z)=(2z-y)/(z-y)#

So,

#x/(x-z)+z/(y-z)=(2z-y)/(z-y)+z/(y-z)#

#=(2z-y)/(z-y)-z/(z-y)#

#=(2z-y-z)/(z-y)#

#=(z-y)/(z-y)#

#=1#