log（2,2）-log（2,1）
    2*8-4
    （5*45）+（1*5）/50
    arcsin0.9077
    3/40+3/88+3/154+3/238-12/85
    3/5*8+3/8*11+3/11*14+3/14*17-12/85
    (13447.33+6305+13039.92+13172.73+13020.52+13175.72+13405.92+12047.27)÷7÷30×154-26813.36-6233.24-2000-1000-1000
    log(2,1000)-6
    2log(2,2.8)
    -log(2,1/60)
    2log(2,2.8)
    log(1000,2)-6
    -log(1/60,2)
    log(2.8,2)
    2log(2.8,2)
    ln9.38
    e0.1
    e0
    1+1
    (1450.4+13447.33+6305+13039.92+13172.73+13020.52+13175.72+13405.92+12047.27)÷7÷30×108-26813.36-6233.24-2000-1000-1000

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