300000+[8*7*（40*2+80）+8*12*(40*2*60%+80*70%)]*（4+3）+50*8*20*(10+3)-25000-54000+40000
    3.36/32
    4.2*10^4*5*16
    0.02*4.6*10^7*0.3
    1.86-1.86*30/31
    4.2*10^3*5*0.6*10^3*0.6
    （77/3216）*274=
    （87/3216）*274=
    （173/3216）*274=
    （236/3216）*274=
    （850/3216）*274=
    （728/3216）*274=
    （728/4530）*274=
    (24+1000/(250+1000*0.033)+1000/(900-2000*0.033))*(0.033+0.8)+(8+1000/(250+1000*0.033))*(0.2-2*0.033)+4*0.033
    (1+12%)/(1+3%)-1=
    1.2*4%+0.8*6%+6%=
    -7/2*18^2+6*18
    sin(π/4)
    20×16/15
    8*6.5+5*12+3*5

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