13 14 16 28 1 -4 -8
1+2+4+5+7+8+10+11+13+14+16+17+19+20+22#23+25+26+28+29(求简便算式)
1 2 5 10 17 26 4 3 6 11 18 27 9 8 7 12 19 28 16 15 14 13 20
.将自然数如下排列,1 2 6 7 15 16 28 29 3 5 8 14 17 27 30 …4 9 13 18 2
将自然数按如下顺序排列:1 2 6 7 15 16 28 3 5 8 14 17 23 4 9 13 10 10 12…
计算.(能简算的要简算)3/4+5/12--11/24=、23/28+(13/14+2/7)=、9/16--1/8--3
(4又4/7-1又11/14)除以(7/12+5/28)*8/13
1+2+4+8+10+12+14+16+18+20+22+24+28+30.+50
(1/2-1/6)×5+1/4×4/5 11/28×8/33+13/14×25/26 4
1,2,4,5,7,8,9,10,12,13,14,15,16,20题.
找规律填数.(),7,8,10,13,17,22,28 2,4,()8,6,(),8,16,10,20 1,4,13,4
1:-2,4,-8,13,-32...2:-4,8,-16,32,-64.3:-4,2,-10,14,-34.找出各行规
24点:1.19,17,3,13,21.2.7,16,14,28,29.3.14,29,3,6,19.4.13,14,1