(20+18.0×0.7+19.4*3.4+19.2*0.8+19.8*4.1+20*1)*0.52-2*40*0.72
    (20+18.0×0.7+19.4*3.4+19.2*0.8+19.8*4.1)*0.52-2*54*0.72
    (20+18.0×0.7+19.4*3.4+19.2*0.8+19.8*4.1)*0.61-2*54*0.87
    (20+18.0×0.7+19.4*3.4+19.2*0.8)*0.61-2*31*0.87
    (20+18.0×0.7+19.4*3.4+19.2*0.8)*0.61-2*31.0*0.78
    (20+18.0×0.7+19.4*3.4 )*0.61-2*42.4*0.78
    (20+18.0×0.7+19.4*3.4)*0.6-2*42.4*0.78
    (20+18.0×0.7 )*0.6-2*10*0.78
    (20+18.0×0.7+19.4*3.4+19.2*0.8)*0.6-2*42.4*0.78
    (20+18.0×0.7+19.4*3.4)*0.6-2*10*0.78
    (20+18.0×0.7)0.70-2×10×0.84
    20×0.70-2×10×0.84
    (8.41×0.7)/2×（2/3×0.7）+(（-36.9-20.56）×1.9)/2×[2/3×1.9×(-2×36.9-20.56)/(-36.9-20.56)+0.7] -20.56x（x/2+2.6）+(8.6x^2)/2（2/3 x+2.6）=126.77x(x/2+2.6)+(46x^2)/2(2/3 x+2.6)
    arccos0.877021
    arccos0.91612
    2/35÷3/7×2/15
    (3/8-1/4)÷(8/9×3/4)
    -8*3^5+2^6
    87+9
    120-24

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