Question

已知a/b=c/d,下列格式中不成立的是 (a-b)/(c-d）=(a+b)/(c+d) c/d=(a+3c)/(b+3

Answer 1

(a-b)/(c-d）=(a+b)/(c+d)

(a-b)/(a+b）=(c-d)/(c+d)

b/(a+b）=d/(c+d)

(a+b)/b=（c+d）/d

a/b=c/d

成立

c/d=(a+3c)/(b+3d)

（b+3d）/d=(a+3c)/c

b/d=a/c

a/b=c/d

成立

a/b=(c+3a)/(d+2b)

(d+2b)/b=(c+3a)/a

d/b+2=c/a+3

不成立