找规侓1,1,3,2(),3,7(),9,5
1+3+5+7+9+.+(2n-1)=
(1) 1,1/3,1/5,1/7,1/9 (2)- 1/2*1,1/2*2,- 1/2*3,1/2*4,-1/2*5
(1)(+9 1/2)+(-3 3/7)+8 1/2+(+3/7)
1/(1*3*5)+1/(3*5*7)+1/(5*7*9)+1/(7*9*11)+1/(9*11*13+)1/(11*1
1/2+3/4-6/5 6/7-1/2+4/5 3/4-(7/12-5/7) 2/3+(13/15+1/3) 15/9-
1+2+3+4+5+6+7+8+9( )1×2×3×4×5×6×7×8×9×0.
找规律 一:1,3,9,27,81,().二:2,3,4,5,8,7,(),().三:1,1,1,3,5,9,(),()
找规律填空:1/3,1/2,5/9,7/12,3/5,()
找规律:1/3,1/2,5/9,7/12,3/5,().
1+3+5+7+9+…+(2n-1)+(2n+1)+(2n+3)
|-7/9|+(2/3-1/5)-1/3乘(-4)的2次幂
1.按规律填数.(1)3,4,5,8,7,16,9,32,( ),( ).(2)1,1/3,1/5,1/7,( ),(