等于8分之3解：3/4-3/8=6/8-3/8=3/8
等于八分之三
3/4-3/8 3/4-3/8=6/8-3/8 =0.75-0.375=3/8 =0.375
先通分再计算，3/4-3/8＝6/8-3/8＝3/8
3/4-3/8等于几？3/4-3/8=6/8-3/8=3/8
