1-5/6+7/12-9/20-11/30-13/42+15/56-17/72+19/90
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/04/30 06:16:01
1-5/6+7/12-9/20-11/30-13/42+15/56-17/72+19/90
1又1/2-6/7+7/12-9/20+11/30-13/42
要简便,有规律!
1又1/2-6/7+7/12-9/20+11/30-13/42
要简便,有规律!
应该是1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90=
吧
1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=1-(1/2+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)+(1/9+1/10)
=1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9+1/9+1/10
=1-1/2+1/10
=3/5
若你的正确:则
1-1/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90=
=1-(1/2-1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)-(1/8+1/9)+(1/9+1/10)
=1-1/2+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+1/9+1/10
=1-1/2+2/3+1/10
=19/15
吧
1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=1-(1/2+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)+(1/9+1/10)
=1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9+1/9+1/10
=1-1/2+1/10
=3/5
若你的正确:则
1-1/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90=
=1-(1/2-1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)-(1/8+1/9)+(1/9+1/10)
=1-1/2+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+1/9+1/10
=1-1/2+2/3+1/10
=19/15
1+1/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
1-5/6+7/12-9/20-11/30-13/42+15/56-17/72+19/90
1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90 简便计算
1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
1-6/5+12/7-20/9+30/11-42/13+56/15-72/17+90/19简算
5/6-7/12+9/20-11/30+13/42-15/56+17/72-19/90=
简便计算:5/6-7/12+9/20-11/30+13/42-15/56+17/72-19/90
1-5/6+7/12-9/2+11/30-13/42+15/56-17/72+19/90 怎么简便
计算1-【5/6】+【7/12】-【9/20】+【11/30】-【13/42】+【15/56】-【17/72】
-1+5/6-7/12+9/20-11/30+13/42-15/56+17/72
1-5\6+7\12-9/20+11/30-13/42+15/56-17/72
1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90这道题用简便方法杂做?