Mathematics
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    1/2+2/3+1/2=
    100/3.6
    1-cos(3.9733)
    1-cos(2.30988)
    1×(1-3∧5)
    -3*(-1/3)*(-2)+(-1/3)^2+(-2)^2
    65/(1.7)²
    sqrt(21)
    125/27-5×25/9+10
    sin20
    360*308(390-35)
    1.0*14.3*200(390-100)
    -3--7
    -3--11
    6+-11
    13+-5
    -6+-11
    20*lg(0.508)
    13.05*sqrt(1+(13.05/10)^2)*sqrt(1+(13.05/20)^2)*sqrt(1+13.05^2)
    100*sqrt(1+(13.05/2)^2)

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