5.668+ln(x)=1/x
    5.559+ln(x)=4/x
    5.397+ln(x)=9/x
    5.204+ln(x)=16/x
    5.024+ln(x)=25/x
    4.852+ln(x)=36/x
    4.852+ln(x)=36/x
    (5(366+x)+(81*4)+(3*51)+(2*13)+(1*25)÷(540+x)=4.6
    4.687+ln(x)=49/x
    4.501+ln(x)=64/x
    4.32+ln(x)=81/x
    4.125+ln(x)=100/x
    3.913+ln(x)=121/x
    3.658+ln(x)=144/x
    3.324+ln(x)=169/x
    2.972+ln(x)=196/x
    2.424+ln(x)=225/x
    0.08x-0.4-9/x^2=12
    cos(x* π )=(-1)^x
    x^2=-1

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