(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
    12/0.85
     (20+18.8×2.2+18.8×6)×3.54+2×0×√0.28
    (20+18.8×2.2)×3.54+2×0×√0.28
     (20+18.8×2.2)×2.04+2×17×√2.04
    20×2.04+2×17×√2.04
    39*25-25*19
    254.89×5.4-1/2×（-33.31）×0.33×5.42-1/6×22×0.33×5.43

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