e^x+e^（-x）
    (40-X)(20+2X)=1200
    x^5+x+1
    x（30-3x）=63
    -x3+8x2+9x＝0
    434/31*x+144/31*(x+15)+93/31*(x+30)=1074
    －32x^2＋47x－16＝0
    T^2+(21-T)^2=15^2
    x^3+2x^2-4x-1=0
    434/31*x+144/31*(x+15)+93/31*(x+30)=1074
    1+1/(1+1/(1+x))=1.54
    161x=1337x
    x-5x-5=20-2x+4
    1.5x-1.5x^2=0
    9x-3-1=10x-14
    5(x-2)= 6x+7;
    X+1
    1/4*A+2/5*A=520
    1÷(x＾2)+x
    (x*0.97*(5+2*x)/(5+x*2*5^0.5))=0.55

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