英语作文（通知类型）：3月12日是植树节，我校将组织全体学生参加植树活动 Comrades，Attention，please。March 12 is our Tree Planting Day.We have decided to go and plant trees that day.All the students in our school are supposed(required)to take part in the activity.Each class must take five or six basins to water the young trees.Others are to take spades to dig holes.We are going to gather on the school playground at seven on the morning of March 12.And then，we will take our school bus to the West Hill.Please don't be late or absent.Thank you.
3月12日植树节，学校先安排了31个人去拔草，18个人去植树，后又派20人去支援他们，结果拔草人数 解：设去支援拔草的有X人 {18+(20-X）}X2=31+x x=15
每年三月12日是植树节，某学校植树小组若干人植树，植树若干棵， 若每人植4棵，得于20棵没人植，若 假设有X个人，4X+20=8X-少植的树0<；少植的树=4X-205X=6（人）总树量=6×4+20=44（棵）
