-5.75x^2+122.85x+27.14=0
    1000/x=1600/(x+15)
    0.09*x＾2+0.63*x+0.4=0
    (1-x)²=0.65
    （4/3）=（5/6）x
    2*（2/3）=（5/6）x
    2:X=（5/6）:（2/3）
    （5/6）:（2/3）=（2/x）
    152x^2-391x+289=0
    -8+3/(1+x)+2.8/(1+x)^2+2.6/(1+x)^3+2.4/(1+x)^4+2.3/(1+x)^5=0
     x+(x-0.08)*0.375 = 0.375
    0.35=4X/(1-4X)
    X*98.39%=3727
    10X-X=9.9
    x+（x/√2）=12/5
    X/1.09-X=29795.5
    (5x^2-10x-4)/(x^2-2x+4)=1-2sqrt(3)
    5a+6a-10=15
    0.38x*4+0.62x*2=13600
    2/3*((1-1/0.01)+(3/4+1/0.01)*(1/3*214.1/x*0.35805183739485175)^0.01)=7.611/x

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