（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
    tan(2.3311/2)
    tan89.358839
    tan1.570796
    (1/3)^-3+log(2,1/8)+(3/4)^0
    (25×2.5)/(cos13)
    (69×2.5)/(cos13)
    √((2×2.15×247.386×1000)/(1×64.149^3 )×(3.21+ 1)/( 3.21))×2.46×189.8×0.713×0.987

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