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)
    sec(180)
    sec(π)
    1-25.014%-0.01×73.26%
    1+22+333+4444+55555+666666+7777777+88888888+999999999 9+88+777+6666+55555+444444+3333333+22222222+111111111

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