真分数a/b的分子和分母同时加上m(a,b,m都为大于0 的整数),则比较a/b与(a+m)/(b+m)的大小,大的是请选择DCBA3E's.q5X9a(@'X-Q.M:z9`)V-o)[
A.a/b9a(@'X-Q.M:z9`)V-o)[
B.(a+m)/(b+m)9a(@'X-Q.M:z9`)V-o)[
C.同样大9a(@'X-Q.M:z9`)V-o)[
D.无法确定9a(@'X-Q.M:z9`)V-o)[