0.024*6.4*300^2
    126.90+90.00+36.50+9.07+22.88+65.63
    0.024*6.4*(300/0.005024)^2
    （126.90+90.00+36.50+9.07+22.88）×23%
    3.14*0.04^2
    126.90+90.00+36.50+9.07+22.88+51.36
    （126.90+90.00+36.50+9.07+22.88）×18%
    （126.90+36.50+90.00）×9.03%
    （126.90+36.50）×1×4.35%+90.00×1×0.5×4.35%
    3.14*0.125^2
    3.14*0.4^ 2
    3.14 * 0 .25 ^ 2 / 4
    100加32
    100除以62
    1/4
    1 ÷ 4
    1÷4=
    (25000-20000)*20%+1000+25000*2%=
    (36000-20000)*20%+1000+36000*2%=
    csc(450)

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