16/21/((4/7+2/9)*16/21)(简算)
16/21/((4/7+2/9)*16/21)(简算)
9,16,7 16,21,5 4,「」9
8/3×(1/3-8/21×8/16) 99×7/10 (3/7+4/21)×21 5/17×9/24+9/17×7/2
1,1,2,2,3,4,5,7,9,12,16,21,等称为帕多瓦数列
找规律1,1,1,2,2,3,4,5,7,9,12,16,21
找规律2,4,7,9,12,14,16,19,21,__,后面一位数应该是多少?
1+3/2+5/4+7/8+9/16+11/32+……+21/1024
15.9/7 - ( 2/7 – 10/21 ) 5/9 × 18 – 14 × 2/7 4/5 × 25/16 + 2
九宫格的数学题填数字 (1) 1 4 7 3 5 2 7 ?11 (2) 7 16 9 5 21 16 9 ? 4 (3
简算 (21/11+6/7+4/3)÷(7/11+2/7+4/9)
5/16×19/21-5/21×3/16(简算)
{3/4-(7/16-0.25)}*16/9简算