(x-55)(540-4x)=6300
    x*0.2=190000
    3x²+16x+15=0
    4（500-20x）（20+x）=39520
    5x^2-19x-24
    5x^2-19x-24=0
    5x^2-19x-24=0
    5x^2-19x-24=0
    5x^2-19x-24=5
    (x+4.04)/2=2.6
    lnx+x-1
    4x+5=29
    x/6760=(1-x)/114100
    x/6760=(1+x)/114100
     9x^2=25x^4-245x^3+867x^2-1274x+676
    -9/25（x-5）^2+9=6
    15r＾2+192000r-6400＾2=0
    16r＾2+332800r+6400＾2=0
    16r＾2+3.328×10000r+6400=0
    (1-x%)^2=0.64

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