12*（x+x-6）=20x
    X/1.09*0.09-X/1.03*0.03=318101.97
    x^2-4x-10=0
    cos√X
    304.5/31*x+186/31*(x+15)+93/31(x+30)=972
    3x^2+12x+8=0
    x^2+2x+0.55=0
    （2x^2-1.5）^2=1-x^2
    （（（（（（（（（（（（（（（（（（（（733-x）*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98-x）*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98-x）*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98-x）*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98-1.25x)*0.98=0
    2.47ln2^x+2.47ln(1-x)^x+2.7704=0.5
    x＋（1/x）=17/4
    13162.619+(y-y*0.825)/1.05*0.05=y
    213162.619+(y-y*0.825)/1.05*0.05=y
    (154.5+191.5)/31*x+248/31*(x+15)+124/31(x+30)=1117
    (1033752.61+x)*(1+0.15+0.12+0.06+0.003)+349920=2677183.6
    (1142661.05+x)*(1+0.13+0.09+0.1+0.003)+294500=2583751.45
    38.75+（x-15）÷20=39+（x-9）÷31
    5s^4+8s^3+18s^2+10s=0
    lgx=1.7993
    x^2-x＋0.0125

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