A(2,8)
    C(2,8)/C(8,8)
    C(2,8)
    sqrt(676)
    abs676
    2/(1+(0.2*2.1^2))^(1.4/0.4)
    4/(1+(0.2*2.1^2))^(1.4/0.4)
    408.1298×2.06
    7.8056×2.06
    1440÷12
    144÷1+20%
    30÷100
    100÷130-1
    130÷100-1
    2*asin(4/5.5)
    sqrt((137-18*0.346)^2-324)/600
    (141-sqrt((4+18*0.341)^2-16))/600
    sqrt((137-18*3.46)^2-324)/600
    2.6（1+5%）^10
    2.8*2/1.5

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