（x+3）²+16（x+2）²＝25²
    (x^2-6)*(2*x-3)=-3
    2a^2=2*23.8^2
    2a^2=23.8^2
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17) = 92.440
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17) = 92.560
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17) = 73.865
    0.7x+0.9(160−x)
    tanx-x＝0.0182849
    （27.134+x）×2.95＝54.269+73.203-x
    （27.134+x）×2.95＝54.269+73.703-x
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=65.591
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.422
    x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.422
     4.13×23.25/51.5+x×28.25/51.5=4.14
    32X=480-32*7
    32X-32*7=480
    480-（32*7）=32X
    7X-32*7=480
    a^2+5*a+25=0

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