-90-arctan3.94
    log（3，27）
    50-15
    50+15
    （528+316.8）*3.5%
    1435÷1.432
    （4.1002－4.20）/（4.1002－4.2124）
    1/2×1.25×〖38.90〗^2×2.0×1.020
    1/2×1.25×〖38.90〗^2×0.9×0.05
    1/2×1.25×〖38.90〗^2×2.0×1.020
    0.5×16
    sqrt(2)
    (3.25+1.61+3.64+3.25+1.61)*2.63*1
    （3.3+5.3+1.2+2.15+2.1）*2.63*10*3
    (1.86+39.68+1.62+3.48+41+4.04+2.86+1.56+13.15+1.56+8.69+0.65+0.65）*2.38
    0.92*2.38*12+0.95*2.38+0.8*2.38*2+1.38*2.38+4.75*1.4+2.8*2.38+1.25*1.43
    (0.92*2.38*22+0.95*2.38*2+0.8*2.38*4+1.38*2.38+4.75*1.4+1.25*1.43*2)*1
    14.7975+11.232+7.5+8.6
    459.186+135.643+114.7335+43.734+33.84+18.2+36.72+17.22
    (3.3+2.14)*(2.17+1.21)*2

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