5\6-7\12+9\20-11\30+13\42-15\56怎么解
来源:百度知道 编辑:UC知道 时间:2024/05/17 06:06:55
5\6-7\12+9\20-11\30+13\42-15\56
=(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)
=1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=1/2-1/8
=3/8
=10/12-7/12+9/20-11/30+13/42-15/56
=1/4+9/20-11/30+13/42-15/56
=5/20+9/20-11/30+13/42-15/56
=7/10-11/30+13/42-15/56
=10/30+13/42-15/56
=14/42+13/42-15/56
=27/42-15/56
=9/14-15/56
=36/56-15/56=21/56=3/8
= (1/2+1/3) -(1/3+1/4) + (1/4+1/5) - (1/5 + 1/6) + (1/6+1/7) - (1/7+1/8)
= 1/2 - 1/8 = 3/8
(1\3+1\4+1\5+1\6)乘(1\4+1\5+1\6+1\7)减(1\3+1\4+1\5+1\6+1\7)乘(1\4+1\5+1\6)=?
2+2为什么=4不=1\2\3\5\6\7
请问怎么在Excel里面插入序号,好象:1\2\3\4\5\6\7\8\9
1*3\1+3*5\1+5*7\1+......+97*99\1
(1-1\2)+(1\2-1\3)+(1\3-1\4)+(1\4-1\5)+(1\5-1\6)+........(1\2005-1\2006
(1-1\2)+(1\2-1\3)+(1\3-1\4)+(1\4-1\5)+(1\5-1\6)+........(1\2005-1\20把括号变为绝对号咋么做06
1\1×3+1\3×5+1\5×7+1\7×9+1\9×11+1\11×13=
5\6-7\12+9\20-11\30+13\42-15\56怎么解
1 2\3 5\9 ( ) 7\15 4\9
1\4\5\6怎样凑24点