20.4-12.8/0.8-4 1.01+[0.05+0.94]+1.5 10.8/0.6-1.4-3.8 [0.6+1.4]/4-0.3
    10+[20-15]+[20-12] 40+[20*10*4-140] 1372/[7*7*7]*100 [400-[600-400]]/[4+4] [800-[900-500-300]]/7 [120-20+50]/3*10
    200+[40*4/10-8] [3200/40-20]*10 10*[22-12-6]
    100-40-[50-30] 200-[190-110]-70
    11+13 12+14
    10*20
    [100-40*2]*10
    [100-12+33]/11
    [10-5]*10
    11+[12+4]
    21-12+22
    12+22
    arctan0
    1+（-1/3）/2
    1321003963011889035667107/243
    649772579597141×27
    649772579597141×57
    2^2021-1
    2^2021-1
    tanarccos0.95

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