100=50%X+5%(1000-X)
    x^4-4*x^3+36*x^2+160*x-192=0
    200x+500=250x-250
    (4560+650-2236)/4560=X/166.51
    (4560+650-4560)/2170=X/166.51
    20×（30+t）÷60＝40t÷80
    100=0.5X+0.05(1000-X)
    -0.013x^4+0.423x^3-4.6939x^2+28.041x+48.301=155
    200（x+2）=150x*2
    -0.013x^4+0.423x^3-4.6939x^2+28.041x+48.301=181
    -0.013x^4+0.423x^3-4.6939x^2+28.041x+48.301=182
    184=-0.013x^4+0.423x^3-4.6939x^2+28.041x+48.301
    -0.156x^2+2.538x-9.3878=0
    x²＋100x=97000
    60+300X=80+250X
    (x-1000-5000-2300)×0.35=4445
    X+(X*0.09) = 198.62
    X+(X*0.09) = 198.62
    √cos（π/4-3x)
    （1/50+1/45）×20+1/45X=1

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