x^2-2x+1=（x+1）^2
    x/x^2=1/x
    1/x=0
    x/x=1
    !(x)=12x^2
    !(x)=x^x
    X－0.63÷0.7＝1
    x^5-10x^4+30x^3-20x^2-35x+40= 0
    x^5-10x^4+30x^3-20x^2-35x+39= 0
    x^5-10x^4+30x^3-20x^2-35x+37= 0
    x^5-10x^4+30x^3-20x^2-35x+36= 0
    x^5-10x^4+30x^3-20x^2-35x+34= 0
    x^5-10x^4+30x^3-20x^2-35x+30=0
    x^5-10x^4+30x^3-20x^2-35x+2=0
    x^5-10x^4+30x^3-20x^2-35x+38=0
    X/(500+25+125)*500=25
    arctan(x^-1)
    sqrt（（x）sqrtx）等于123
    (200+y)(50-y/5)=10125
    27*21-（27-18x）（21-14x）=119

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