5/6+5/12+5/20+5/30+5/42+5/56+5/72(简算)
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5/6+5/12+5/20+5/30+5/42+5/56+5/72(简算)
5/6+5/12+5/20+5/30+5/42+5/56+5/72(简算)
5/6+5/12+5/20+5/30+5/42+5/56+5/72(简算)
5/6+5/12+5/20+5/30+5/42+5/56+5/72
=5×(1/2-1/3+1/3-1/4+……+1/8-1/9)
=5×(1/2-1/9)
=5×7/18
=35/18
原式=5*(1/6+1/12+1/20+1/30+1/42+1/56+1/72)
=5(1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9)
=5(1/1-1/2+1/2-1/3+.....-1/9)
=5*8/9=40/9
5/6+5/12+5/20+5/30+5/42+5/56+5/72(简算)
[(-20)-(+5)]-[(-5)-(-12)]
2/5+6/5+12/5+20/5+.+9900/5=?简便计算2/5+6/5+12/5+20/5+.+9900/5=?简便计算
6/5,5,6,30,).
((-14/5)^4*(-10/7)^3*(-5/12)^2*(-3/20)^1)/|5/6-13/12+19/20-31/30|
5/6-7/12+9/20-11/30+13/42
5/6-7/12+9/20-11/30+13/42
11/30+9/20+7/12-5/6+1/2
5/6-7/12+9/20-11/30=?
(5,6,12)(4,8,20)(8,30)
2/5+4/7+5/6+7/12+9/20+11/30+12/35+19/42
2/5+4/7+5/6+7/12+9/20+11/30+12/35+19/42
6分之5加12分之5加20分之5加30分之5加42分之5加56分之5等于
(5*6*1/30)12*(-6)+4
5 ( ) ( ) ( ) ( ) 12 ( ) ( ) ( ) ( ) ( )6 ( ) ( ) ( ) ( ) ( )( ) 5 ( ) ( ) ( ) ( )( ) ( ) ( ) ( ) ( ) ( )1 ( ) ( ) ( ) ( ) ( )
30 5 1 4 12 6 )
简算(5/14)*(5/6)-(7/12)*(5/14)+(9/20)*(5/14)
5 6 8 12 20 求通项公式