x*x-14.4x+9.17=0
    x^3+40x^2+400x+100＝0
    tanx=x^2
    25x^2+5x-12=0
    x^3-3*x^2+18*x-27=0
    x^4-10x^3+27x^2-10x+1=0
    x^5-9x^4-16x^3+32x^2-7x-1 = 0
    x^5-9x^4-16x^3+32x^2-7x-1=0
    x^5-9x^4-16x^3+32x^2=0
    17x^3-307x^2+1783x-3301=0
    x^7-23x^6+112x^5-115x^4-37x^3+33x^2+12x-1=0
    x^5-15x^4+85x^3-225x^2+274x-120=0
    X*0.09+X=103
     (x-sinx)/x^2
    3x+10
    100x²-60x-38=0
    x=2^(x-5)
    7（x+0.5）=4.9
    1.75x-2=0.75x+0.5
    x(x2+x-1)-(x4-2x)÷x

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