5+(-6)+3+9+(-4)+(-7)
3'4'5'6'7'8'9
(7/9-5/6+3/4+7/18)/(-1/36)
7/9+3/4+5/6-7/18
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
9/2×5/3 7/6×9/7 8/5×15/4 20/9×21/5
1*2*3+2*3*4+3*4*5+4*5*6+5*6*7+6*7*8+7*8*9+8*9*10+9*10*11+10*
1+2+3+3+4+5+5+6+7+7+8+9+9……+5000
5+9+7-5+9-4+6-9+3+7+5-8+9-7+6-3+4-2+9-8等于多少?
***3***9***49*6**2*19*4***6***7***5*2*5***6*4*4***3***9***3*
10 9 8 7 6 5 4 3 2
2 3 4 5 6 7 8 9 10