50x-30x-951-(0.65x-0.25x-15)=0
    50x-30x-951-(0.65x-0.025x-15)=0
    50x-30x-951-(0.65x-0.024x-15)=0
    50x-30x-951-(14.6x)=0
    50x-30x-951-(-14.6x)=0
    50x-30x-951--14.6x=0
    x*235.0439+（1-x）*238.0508=238.0289
    X-6.5%X=498000
    （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

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