C(5,1)*C(4,3)
    C(9,4)
    35-17
    arctan1
    3.2*0.6
    0.6*0.6
    5.3%=20 1%=
    5.3%
    20/5.3
    0.5259+0.1788
    2.763*0.0647
    √8625
    1+2
    e^（-2.5）
    e^（-5）
    A(3,3)
    A(3,1)
    2.18×19.44×7.54
    330/（1+10%）+440/（1+10%）^2
    330/（1+10%）+440/（1+10%）2

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