x^3-10x+3=0
    x3-10x+3=0
    (13x+8)÷3=5x-1
    6x÷8=12
    (x-9)[(x-42)(x-56)-46*46]-225(x-56)-20*46*15-20[15*46+20(x-42)]
    18-(12-2x)=16
    0.4 = -0.0003x*x + 0.0027x + 0.4768
    1（1-x）+x*4=5(1-x)+0*x
    0.4 = -0.0003x2 + 0.0027x + 0.4768
    x=15.219/((0.0011602/x^0.6)+0.0048+(1/145.62))
    100+x／280-40-x／280≥0.6
    1.23/1.24*(1.24+2*x)=30
    1200/（1+x）+6000/（1+x）*2+6000/（1+x）*3=9000
    2*x^3-15*x^2-50=0
    15.2195=(32647.19/x^0.6)*x+0.011667*x
    15.219/(32647.19x^0.6+0.011667)=x
    1（1-x）+x*4
    5（1-x）+x*0
    x^(2)－2x＋1>0
    15.219/(0.01166+32.6479*x^0.6)=x

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