1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42等于多少?

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/25 01:26:58
1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42等于多少?

1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42等于多少?
1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42等于多少?

1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42等于多少?
1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42
=1+3+5+7+9+11+1/6+1/12+1/20+1/30+1/42
=(1+11)x6÷2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=36+1/2-1/7
=36+5/14
=36又5/14

1+3+5+7+9+11=36
1/6+1/12+1/20+1/30+1/42=1/2-1/3+1/3-1/4+1/4-1/4+1/5-1/6+1/6-1/7=1/2-1/7=5/14
原式=36又5/14

1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42
=(1+3+5+7+9+11)+(1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7)
=6×6+(1/2-1/7)
=36又5/14

=1+3+5+7+9+11+1/6+1/12+1/20+1/30+1/42
=36+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=36+1/2-1/7
=36+5/14
=36又5/14

36又5/14