(68*12)+(5*27)+(13*24)+(18*35)=?
(68*12)+(5*27)+(13*24)+(18*35)=?
46+24×13 186÷31×9 (45-27)×5 12×(13+12)÷50 27-18+49 = = = = =
63/70= 11/55= 30/35= 15/20= 42/68= 27/135= 17/51= 3/81= 18/5
通分:3/51和2/17 5/12和7/18约分:13/169 35/140 24/48
6+9+12+15+18+21+24 +27+30=?
用某种排序方法对序列(29,98,24,47,15,27,68,35,18)进行排序,记录序列的变化情况如下 18,15
把下面各数分解质因数 12 8 18 16 15 24 27 35 10 6 14 20 9 22 28 30 51 5
13 16 19是勾股数吗17 21 23是勾股数吗 18 24 36是勾股数吗 12 35 37是勾股数吗
约分6/4=49/7=24/8=27/18=36/27=65/13=
2,3,4,5,7,12,13,18,19,24,25,30,32,33,34,35把这些数平均分成四组,其和分别为44
3,4,5,6,7,8,11,12,13,14,15,16,17,18,21,22,23,24,25,26,27,28,
2+3+4+5+7+8+9+10+12+13+14+15+17+18+19+20+22+23+24+25+27+.+10