关于荷花的作文300字:-1/42-1/56-1/72-1/90-1/110=?快点!
来源:百度文库 编辑:高校问答 时间:2024/06/05 11:22:24
做作业,所以请把方法告诉我,以后再碰到就不怕了.
-0.0281385281
0.0281385281
巧算 1/30+1/42+1/56+1/72+1/90
30/1+42/1+56/1+72/1+90/1=?
20/1+30/1+42/1+56/1+72/1+90/1
1/20+1/30+1/42+1/56+1/72+1/90
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
-1/42-1/56-1/72-1/90-1/110=?快点!
1/22+1/30+1/42+1/56+1/72+1/90=?简便方法是什么?
谁能巧算1-1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=______