12,2,2,3,14,2,7,1,18,1,2,3,40,10,(),4
数学推理题:12,2,3,14,2,7,1,18,3,2,3,40,10,( ) 4
1+2+3+4+5+6+7+8+9+10+12+14+16+18+20=?
数列 -3,-4,-6,-10,-18( ) -2,-1,2,7( ) 14,50,-36,86( ) 64,48,40
找规律填空.(1)2,6,18,54,(),(),(2)1,2,4,6,7,10,10,14,(),().(3)1,3,
1-(10/21-3/14) 3/8+(11/12-7/20) 2/3-7/12+4/5 x-3/8-1/8=11/18
0 1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 17 18 19 20 30 40 50 6
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,30,40,50,
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 30 40 50
三角形数阵,1;2,3;4,6,5;8,12,10,7;16,24,20,14,9;32,48,40,28,18,11;
-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,2
2*3+4*6+6*9+8*12+10*15+12*18+14*2分之1*2+2*4+3*6+4*8+5*10+6*12
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19.100=?