若a/b=c/d(abcd都不等于0),则下列式子错误的是Aa-b/b=c-d/dBad=bcCc/a=d/bDa-b/a+b=c-d/c+d

Question

若a/b=c/d(a b c d都不等于0),则下列式子错误的是
A a-b/b=c-d/d B ad=bc C c/a=d/b D a-b/a+b=c-d/c+d

Answer 1

d是错的.