(194.3×8.4+336.87×4.12+129.36×1.05)-(2.84×2.32+ 351.69×1.03+204.2×8.98+106.24×6.18)=
    (111.31+197.19)/2×2.3=
    (111.31+197.19)/2×2.28=
    (44.01+69.47)/2×2.3=
    (2×111.31+197.19)/(3(111.31+197.19))×2.28=
    (2×27.06+29.82)/(3(27.06+29.82))×(4.8+4.1-8.8)+2.3=
    (2×27.06+29.82)/(3(27.06+29.82))×(4.8+4.1-8.8)+2.28=
    -2-1
    （2560-1000）/（3000-2560）
    arctan((5*12)/(47+3*22+5*(12/tan70)))
    (5*12)/(47+3*22+5*（12/tan70）)
    0.231*0.8*75*0.001*(180-67)
    2*5*6*9*9
    arctan2.105263
    arctan(12/5.7)
    sqrt8444
    0.90×2×14.9
    11.49 + 20.5 + 14.9
     8.36 + 3 + 1/7.605
    (1.98/tan35)*2

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