1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/21 21:29:33
1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=?1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=?1+1/3-7/12+9/20-11

1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=?
1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=?

1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=?
1+1/3-7/12+9/20-11/30+13/42-15/56+17/72
=1+1/3-(3+4)/12+(4+5)/20-(5+6)/30+(6+7)/42-(7+8)/56+(8+9)/72
=1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8+1/8+1/9
=1+1/9
=10/9

1+1/3-7/12+9/20-11/30+13/42-15/56+17/72
=1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8+1/8+1/9
=1+1/9
=1又1/9