110+120+2*x=180
    x^2+2x+1=1
    2（2-2x）=x²
    500(1+x)＾2=7200
    air purifier
    x^3-3x^2+8x-4=0
    2（x+2）^2-8=0
    x+ln(x+1)
    x^x＝e
    3x^2 + 2x - 5
    2x^2 + 3x - 4
    16.3=（（（100x-55）/45）^2）*16.5
    16.3=（（（100x-55）/45）^2）*16.6
    16.3=（（（100x-55）/45）^2）*16.4
    x^2 + 4x + 4 = 0
    sin(x)+cos(x)=0.2
    sin(x)+cos(x)=1/5
    25x^2+80x-272
    -0.25*x^2+4*x-12=1.5
    3^(2*n-1)+9^n=108

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