193.191×(5.6+3.8-2.8)-336.97×1.49
    0.8×2.83×10^6 /（300×0.95×80）
    (169.5×6.55+365.08×2.11)
    (169.5×6.55+365.08×2.11)-193.191×(5.6+3.8-2.8)-336.97×1.49
    (30.72+144)/2×3.8
    (169.5×6.55+365.08×2.11)-193.191×(5.6+3.8-2.8)-166×1.49
    (2×30.72+144)/(3×(30.72+144))×3.8
    (2×47.539+100.8)/(3×(47.539+100.8))×(5.6+3.8-4.6)=
    1.75+4.8
    (5.6+3.8-4.6)
    1/3×(4.6-(-0.651)
    1/3×(4.6-(-0.651)+(5.6+3.8-4.6)
    1/3×(4.6-(-0.651))(5.6+3.8-4.6)
    5.551*3.8^2+58.641*3.8+53.09=
    169.5+53.09
    5.551*3.8*3.8+58.641*3.8+222.59=
    43.68*3.8
    (14.906*3.8+30.72)/2
    (14.906*3.8+30.72)/2×3.8
    58.641+11.102*3.8

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