3000×20%×(50÷100)
    3000×60%×(10÷12)
    2000×60%×(10÷15)
    cos0.45*2*8.3
    !(25)
    tan2（36.7）
    （23×2.8+13.83*15.4）/9
    （18.3*3.2+17.8*15.4）/9
    C(10,9)*2^1+C(10,8)*2^2+C(10,7)*2^3+C(10,6)*2^4+C(10,5)*2^5+C(10,4)*2^6+C(10,3)*2^7+C(10,2)*2^8+C(10,1)*2^9+C(10,0)*2^10
    tan0.7647
    360×16×3.14×(〖25〗^2/4)×377.5
    2/3×1×14.3×3.14×〖450〗^2×450×(sin (0.28π))^3/π=
    C(5,0)*2^0+C(5,1)*2^1+C(5,2)*2^2+C(5,3)*2^3+C(5,4)*2^4+C(5,5)*2^5
    C(4,0)*2^0+C(4,1)*2^1+C(4,2)*2^2+C(4,3)*2^3+C(4,4)*2^4
    C(6,0)*2^0+C(6,1)*2^1+C(6,2)*2^2+C(6,3)*2^3+C(6,4)*2^4+C(6,5)*2^5+C(6,6)*2^6
    C(3,0)*2^0+C(3,1)*2^1+C(3,2)*2^2+C(3,3)*2^3
    C(3,1)*2^2
    (100/95)*5
    5.2631579/5%
    100/(21/20)

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