(4-t)²+4t²=16
    5x²+8x=0
    （350-x）*（30-x/5)=12000
    16x²-250x+34
    16x²-250x+34
    16x²-250x+34
    3t^2-16t+16=0
    200*40+(40-x)*（200+2x）+（400-2x)*（50-60）=9200
    36xxxx-36xxx-100xx+144x-100=0
    36x4-36x3-100x2+144x-100=0
    x^2-416x+7800=0
    （90-50-x）*（20+2x）=1200
    m^2+(m+12)^2=200
    72x+x²=180
    √2*10=m^2+(m+12)^2
    m^2+(m+12)^2=10*sqrt(2)
    5y+5/7=-15-5/1
    5y+5/7=-15-5/1
    (10+2x)*(76-4x)=1024
    0=x^2-2x-3

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