2200/2x＝1000/x
    90000=(400-x)(400-x)-x*x
    x+x²＝96
    300^2=(400-x)^2-x^2
    √x/（e^（2x））
    (16-9x^2)(x^2-16)=320/3
    27x^2-480x+848=0
    750=5m+10(200-m)
    15x+35(100-x)=2700
    x=4.52-34450416/9604000
    x=390625*2.8*8.7808
    x = 1.408*198.95904-21.8592*8.7808
    x = 1.408*198.95904/8.7808-21.8592
    x=（1.408*198.95904/8.7808-21.8592）/2.8
    x=1.408*198.95904-21.8592*8.7808
    1/3*x+1=-4/5*x+5
    lnm+m＝2
    345=(x-384)((616/(x-308)+1)
    2x^2=3
    2x=3+8

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