1.[(5.84-3.9)/0.4+0.15]*0.92
2.4.38/(36.94+34.3*0.2)
3.(284+16)*(512-8208/18)
4.5.4/[2.6*(3.7-2.9)+0.62]
5.[(7.1-5.6)*0.9-1.15]/2.5
6.32.52-(6+9.728/3.2)*2.5
7.5.8*(3.87-0.13)+4.2*3.7
8.8/9*[15/16*(7/16-1/4)/1/2]
9.[5 1/2-1.04*(1 2/3+5/6)]/2.9
10.6 3/7 /3/7-[(7-0.5)*1/4]
11.(0.75+0.2)/0.25*25%+12/0.75+7.2/2.4
12.1.21*42-(4.46+0.14)*1375+450/18*25
13.1+0.45/0.9-0.75-168.1/(4.3*2-0.4)
14.605*8+3.5-44+10.9-(6.6+0.125/12.5%)
15.56*（56-65）*[0.325-62/30+（56/8）-65 ]
16.4/7*5/9 + 3/7*5/9-3/4 × 8/9 - 1/3
17.50＋160/40 *（58+370)/（64-45）
18.347+45×2-4160÷52
19.6-1.6÷4+ 5.38+7.85-5.37
20.5.4÷[2.6×（3.7-2.9）+0.62]