2/25,30/16,25/39,50/36,(
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2/25,30/16,25/39,50/36,(
448,( )60,22,8,3
1/(3*3-1)+1/(5*5-1)+1/(7*7-1)+1/(9*9-1)+1/(11*11-1)的值等于多少?
448,( )60,22,8,3
1/(3*3-1)+1/(5*5-1)+1/(7*7-1)+1/(9*9-1)+1/(11*11-1)的值等于多少?
164
(3+8)*2=22
(8+22)*2=60
(22*60)*2=164
(60+164)*2=448
1/(3*3-1)+1/(5*5-1)+1/(7*7-1)+1/(9*9-1)+1/(11*11-1)
=1/(3-1)(3+1)+1/(5-1)(5+1)+1/(7-1)(7+1)+1/(9-1)(9+1)+1/(11-1)(11+1)
=1/2*4+1/4*6+1/6*8+1/8*10+1/10*12
=0.25*(1/1*2+1/2*3+1/3*4+1/4*5+1/5*6)
=0.25*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=0.25*(1-1/6)
=5/24
(3+8)*2=22
(8+22)*2=60
(22*60)*2=164
(60+164)*2=448
1/(3*3-1)+1/(5*5-1)+1/(7*7-1)+1/(9*9-1)+1/(11*11-1)
=1/(3-1)(3+1)+1/(5-1)(5+1)+1/(7-1)(7+1)+1/(9-1)(9+1)+1/(11-1)(11+1)
=1/2*4+1/4*6+1/6*8+1/8*10+1/10*12
=0.25*(1/1*2+1/2*3+1/3*4+1/4*5+1/5*6)
=0.25*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=0.25*(1-1/6)
=5/24
按规律填空 35 42 30 39 25 36 ( ) ( ) ( )
把25\50、20\30、56\49、39\26约分
(25/2+X)/(36+50)=0.25
“1,-4,9,-16,25,-36”和“-2,8,-18,32,-50,72”的规律
找规律填数:1、2、4、6、9、12、16、20、25、30、36、42
25/39*13/30=
请问:15 16 25 9 81 ()A.36 B.39 C.49 D.54
16-36=25-45
观察下面2组数:1,-4,9,-16,25,-36,.-2,8,-18,32,-50,72,.
观察下面两组数:1,-4,9,-16,25,-36,...-2,8,-18,32,-50,72,...(1)两组数各按什
观察下列两组数:(A)1,-4,9,-16,25,-36,.(B)-2,8,-18,32,-50,72,.
1+4+9+16+25+36+49+.n^2