11/1*2*3+1/2*3*4+.+1/98*99*100
21/2-1/4-1/198+1/200
3.(23/4-3/4)*(3*6+2)
44.3/7×49/9-4/3
5.8/9×15/36+1/27
6.12×5/6–2/9×3
7.8×5/4+1/4
8.6÷3/8–3/8÷6
9.4/7×5/9+3/7×5/9
10.5/2-(3/2+4/5)
11.7/8+(1/8+1/9)
12.9×5/6+5/6
13.3/4×8/9-1/3
14.7×5/49+3/14
15.6×(1/2+2/3)
16.8×4/5+8×11/5
17.31×5/6–5/6
18.9/7-(2/7–10/21)
19.5/9×18–14×2/7
20.4/5×25/16+2/3×3/4
21.14×8/7–5/6×12/15
如何?