题目:
已知有理数A,B,x,y满足A+B≠0,且(A+B):(A-B)=(2x+y):(x-y),那么A:(A+B)=( )
A.3x:(2x+y)
B.3x:(4x+2y)
C.x:(x+y)
D.2x:(2x+y)
答案:
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