（1+r）2=1.75
    x²-26=16x
    x²+26=16x
    （4-x）（200+50x）+[-2×（200-50x）]＝450
    25-a²-a²-a²+（-15+3a+3a+3a）＝1
    25-a²＝-15+3a
    680x=58240-2080x
    A*742=11742
    X^2+4x+1
    9x^2-7x-22
    9x^2-14x+48
    （x-7）*(9x-4)
    27x^2-129x+84=0
    4*（12.5a）^2+60*12.5a+900=1225*a^2
    x^2-x+1=0
    x²-1.5x-9
    x*1/ex
    7x^2-28x+1=0
    sqrt((6800+x)^2+x^2)-(6800+x)=52.1
    sqrt((6800+x)^2+x^)-(6800+x)=52.1

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