估算:100+700+600 =800+600 =1400辆(约等于)笔算:98+703+594 =801+594 =1395
估算:100+700+600 =800+600 =1400辆(约等于)笔算:98+703+594 =801+594 =1395 应该是这样,选我!
368+645-543