a^2/(4+a^2-5a)=2.6
    -3.6*a^2-5.2*a+2.6=0
    -3.6x^2-5.2x-2.6=0
    -3.6x²-5.2x-2.6=0
    100x+550 =120x-630
    100x+550 120x-630
    （220*63-x）*0.95=11425.15
    11.9c=（3.3+c）×7.97
    [（220+220）*（63-7）-X]*0.9=20089.13
    4.1*(x-0.46)^2=(0.28+x)*(1.2-x)
    X-(60/100)
    98219.55-（19628.67-（3938988+x-4114000）/1.09*0.09-16513.75）*1.12-237725.06*0.0006=X
    X-(3/5）X=2400
    X−(60/100)X=2400
    X/（4000+X）=60%
    98219.55-9455.59*1.12-237725.06*0.0006=X
    （10+x）（500-20x）=6000
    （10+x）（500-20x）
    sqrt(((373000)/(10*x))^2+3*((364000*3*x)/(2*10))^2)=1.1*215
    sqrt(((364000)/(2*0.7*8*x*1.22))^2+((273000)/(2*0.7*8*x))^2)=160

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