按规侓填数(1)(),2,3,6,5,10,7,();(2)40,20,(),5;(3) 1,2,4,5,7,8,10,(),().
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按规侓填数(1)(),2,3,6,5,10,7,();(2)40,20,(),5;(3) 1,2,4,5,7,8,10,(),().
按规侓填数
(1)(),2,3,6,5,10,7,();
(2)40,20,(),5;
(3) 1,2,4,5,7,8,10,(),().
按规侓填数(1)(),2,3,6,5,10,7,();(2)40,20,(),5;(3) 1,2,4,5,7,8,10,(),().
(1)每两个为一组,后者是前者的二倍,故填(1) (14)
(2)等比数列,公比为0.5,故填(10)
(3)奇数次项成公差为3的等差数列,偶数次项亦是如此,故填(11) (13)
1. 1 14
2.10
3.11 13
(1)(1),2,3,6,5,10,7,(14);
(2)40,20,(10),5;
(3) 1,2,4,5,7,8,10,(11),(13).
按规侓填数5,7,2,5,3,2,1,( )
按规侓填数(1)(),2,3,6,5,10,7,();(2)40,20,(),5;(3) 1,2,4,5,7,8,10,(),().
按规侓填数(1)2,3,5,8,12,();(2)2,3,5,8,13,();
1/2,1/3,5/6,( ),12/6,( )
1/6、1/3、1/2( )、5/6、1.
6-5×(-1/2)3次方
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
(-1/4)+5/6+2/3-1/2
1/6(3×-6)=2/5x-3
2/3,1,6/5,4/3,( ),3/2
按规侓填数:1/4,4/9,( ),16/25,( ).
()3( ) × ( )6 ------------- 1 ( )( ) 6( ) ( ) 5------------- 8 ( )( ) ( )()3( ) × ( )4 ------------- 2 ( )2 8( )1 ( ) 0------------- 3 ( ) 1 ( ) 8
1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=
1 3/4-5/6-(+1 1/6)-(-1/2)
(-1 2/3)乘1/5-|-5/6|除以(+ 2 1/2)等于多少?
①(1/5)-(-2/5)+3/5 ②(-1/3)-5/6-1/6 ③(-51/6)-21/3+(①(1/5)-(-2/5)+3/5②(-1/3)-5/6-1/6③(-51/6)-21/3+(-1/2)④-5-(-2.5)+(-1/2)
1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?
1/(1×2×3)+1/(2×3×4)+1/(4×5×6)、、、、+1/(48×49×50)