（4.8+4.66+4.52+5.65-3.97+3.75+3.47+4.43）/4
    4.4+（4.8+4.66+4.52+5.65-3.97+3.75+3.47+4.43）/4
    16-9
    26*（1000*6/667-2.2）-0.3*26*1000*6/1334
    24*（1000*2.2/667-2.2）-0.3*24*1000*2.2/1334
    24*（1000*2.4/667-2.4）-0.3*24*1000*2.4/1334
    24*（1000*2.4/667-3）-0.3*24*1000*2.4/1334
    sin[2arcsin(π/6)]=
    arcsin(π/6)=
    arcsinπ/6=
    sin[2(arcsinπ/4)]=
    sin2(arcsinπ/4)=
    sin2(arcsin1)=
    sin22．5
    6*√12
    6*√12
    2*√12
    6*2√3
    2-1=
    e(-3. 8)

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