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8:C
1:=(x+y)/(y-x)-y/(y-x)-(2x-y)/(y-x)
=(x+y-y-2x+y)/(y-x)
=1
2:=3(a-b)/2*ab/[(a+b)(a-b)]
=3ab/2(a+b)
1:=(x+y)/(y-x)-y/(y-x)-(2x-y)/(y-x)
=(x+y-y-2x+y)/(y-x)
=1
2:=3(a-b)/2*ab/[(a+b)(a-b)]
=3ab/2(a+b)
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