要标序哦

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要标序哦要标序哦 要标序哦2(1)(a+b)/(a+b)=1(2)a/(a+1)-1(a+1)=(a-1)/(a-1)=1剩下的马上,先给你前两个的.(3)=x^2/(x-2y)-4y^2/

要标序哦
要标序哦
 

要标序哦
2 (1)(a+b)/(a+b)=1
(2)a/(a+1)-1(a+1)=(a-1)/(a-1)=1
剩下的马上,先给你前两个的.
(3)
=x^2/(x-2y)-4y^2/(x-2y)
=(x^2-4y^2)/(x-2y)
=(x+2y)(x-2y)/(x-2y)
=x+2y
(4)
=(3a-b-4a+3b)/(a-2b)
=(-a+2b)/(a-2b)
=-1
3(1)选择C.
=(a+b-2a)/(b-a)+2b/(a-b)
=1+2b/(a-b)
=(a+b)/(a-b)
希望帮得到你O(∩_∩)O~