c0,b>0,化简/a-c/+/a-b/+/c-b/ 日期:2020-01-11 17:24:47 人气:1 c0,b>0,化简/a-c/+/a-b/+/c-b/ /a-c/+/a-b/+/c-b/ 如果a>b =(a-c)+(a-b)+(b-c) =2a-2c 如果a