y-y^2=1
    5(x^1/2)x(2-5x)=6*3^1/2
    x^3+x^2+2x+3=0
    x＾3+2x-3=0
    19.32-0.006x-x=322
    220X+（130*0.7-X）*150+65*65+65*0.25*75=22696
    220X+（130*0.7-X）*150+65*87*0.25+87*0.25*75=22696
    s^2+0.6s+10=0
    3－4x÷6
    240-4x=40+(28/3)x
    3/6-4x≤2x－2x/3+1
    24-4x=40+9x
    180=30+6y
    180=80+6y
    240-4x=40+16x
    180=3x+(5x-20)
    x*x*2*5=4470
    －11x≤11
    x^3+5x^2-6x+5=0
    x*x*2*4.5=4470

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