(10-x)(600-10x)=10000
    (44-x)(20+5x)=1600
    x=6.34/(15+x)*[(15+2x)^(1/3)]
    (sin(x)/sin(40-x))(sin(50)/sin(20))(sin(40)/sin(30))=1
    x=5[(28+3x)^(1/3)]/(28+1.5x)
    x=2
    16.56x^2-89.98x-171.23=0
    5.32x^2-64.45x-171.23=0
    -5.58x^2+129.79x-142.53=0
    x/(1+x)=0.99
    12586.15=63*32+（220*63-x）*0.95
    12586.15=63*32+（220*63-x）*0.95
    tanx=2x
    x^4-(6+5)*x^3+(7*6-1)*x^2-(13*6-21)*x+3*6=0
    2*3*4*(n-2)-2*3*(n+5)=0
    3*4*(n-2)^2-2*3*(n+5)*(n-2)+2*(7*n-1)=0
    4*(n-2)^3-3*(n+5)*(n-2)^2+2*(7*n-1)*(n-2)-(13*n-21)=0
    (n-2)^4-(n+5)*(n-2)^3+(7*n-1)*(n-2)^2-(13*n-21)*(n-2)+3*n=0
    (n)^4-(n+5)*(n)^3+(7*n-1)*(n)^2-(13*n-21)*(n)+3*n=0
    x^4-(5+5)*x^3+(7*5-1)*x^2-(13*5-21)*x+3*5=0

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