30x+20×（26-X)=756
    30x+20X(26-X)=756
    0.13x=-0.002(x-150)^2+45
    0.12x=-0.002(x-150)^2+45
    0.12x=(x-150)^2+45
    411.11/3100+82.22/2600+0.7x/2700+0.3x/2650+170/1000 = 0.99
    395.35/3100+79.07/2600+0.7x/2700+0.3x/2650+170/1000=0.99
    x^2+(-3x+6)^2=10
    a*（a+4）=35
    -342.18*x^5+534.94*x^4-292.02*x^3+61.25*x^2-3.4647*x=0
    -342.18*x^5+534.94*x^4-292.02*x^3+61.25*x^2-3.4647*x=0
    2x^2+12x=96
    x(x-1)(x-2)(x-3)+2*x(x-1)(x-2)-x(x-1)+x=0
    5x∧3+7x∧2-25x+30＝0
    x^3-38x^2+23x-494
    5t^2+t-500=0
    x（x＋1）＝240
    X/87+30/135-(62-X)/1000=0.333
    X/87+35/135-(57-X)/1000=0.333
    X/87+30/135-(62-X)/1000=0.333

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