当a-b/a+b=1/3时,求9(a-b)/a+b-a+b/2(a-b)的值已知a+2B,c+5a(a不为0),求6a+2b-c/a-4b+c
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当a-b/a+b=1/3时,求9(a-b)/a+b-a+b/2(a-b)的值已知a+2B,c+5a(a不为0),求6a+2b-c/a-4b+c
当a-b/a+b=1/3时,求9(a-b)/a+b-a+b/2(a-b)的值
已知a+2B,c+5a(a不为0),求6a+2b-c/a-4b+c
当a-b/a+b=1/3时,求9(a-b)/a+b-a+b/2(a-b)的值已知a+2B,c+5a(a不为0),求6a+2b-c/a-4b+c
应该是(a-b)/(a+b)=1/3 ==>A+B=3A-3B ==>A=2B
所以9(A-B)/(A+B)-(A+B)/(2(A-B))
=9B/(3B)-3B/(2B)=3-3/2=3/2