2 3 4 5 6 8 9
- - - - - - - - - 》《- - 7 1- -2 8 -》《8 9- -5 3 - - 1》《- -4 -
8 26 9 5 8 3 6 2 4 1 9 9 9
5+1+2+1+3+9+8+4+5
1+1+2+2+3+3+4+4+5+5+6+67+78+8+9+9
(5/12)/(2/3)-3/8*4/9 简算
1*2*3*4*5+5*6*7*8*9/5*6*7*8*9
5×6×7×8×9分之5×6×7×8×9-1×2×3×4×5
11 9 7 9 8 13 5 ? 4 5 2 8 3 ? 7 2
9/2×5/3 7/6×9/7 8/5×15/4 20/9×21/5
1/9+1/5+3/5+4/9+2/3+7/8+1/6+5/7+3/7+5/8+3/5+1/8+2/9=?
7/9*5/6/14/27 1/2*2/5+9/10/9/20 5/8*1/4/5/8*1/4 (1/2+2/3+3/4