ln2+ 1/4
    ln7/2+1/16
    ln3/2+9/16
    ln3/2
    1/683
    54545459/8855858-5556+54515445-544145*541405+5541-1451
    2*5+6586+5563+55-45456
    90-arctan1-arctan0.01
    lg200
    50÷100-5÷100=
    0.6×1.16×1.234
    642.41/(446.89×1.234)
    90.04+(533.26-90.04)(2×7.85)/19.5
    1826.24×(1-(4×〖7850〗^2)/〖19500〗^2 )
    (4560+650-1102)/4560
    (4560+650-1102)/4560
    (4560+650-1102/4560
    (2170+650-2236)/2170
    2236-【1300/2-（50+31.6+31.6）】
    (2170+650-1134)/2170

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