4*(cos2π/7)^2
    6218007/（1+6.81%）+1881769/（1-6.45%）+392425/（1+8.26%）=
    lg-1 0.6439
    lg-1 0.6329
    9/2-3*3+2
    30²-4*2400
    5/6×3
    1000÷4.367
    1000÷4.605
    1000÷4.892
    1000÷5.051
    1000÷2.661
    1000÷2.818
    1000÷2.984
    1000÷3.748
    1000÷5.203
    1000÷3.763
    1000÷4.054
    1000÷4.350
    1000÷4.721

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