12/x-12/1.2＝10/60
    2^3x+4 - 2^3x+3 = 512
    2^3x+4-2^3x+3=512
     15(x-10)+10x = 1600
    1500x-270000 = （1800x-324000）-720000
    1500x-270000 = （1800x-324000）-7200
    1500x-270000=（1800x-324000）-300
    （x-450）*0.75/2000 ={（x-180）*0.75-300}/2400
    100-x/x=0.04
    （x-180）*0.75/2400
    （1/3200）x=（3/8000）x
    （x-180）*0.75/2400=（x-450）*0.75/2000
    x^22=9.69
    x*x*x+2x*x+2x-2
    （m-1)（m-1）+4=m*m
    (1+x)^16-(1+3x)^6+2x
    1+m=√m*m+4
    (125-a)(75+a)-70(75+5a)
    C(x,5)+29*C(x+1,5)+60*C(x+2,5)+29*C(x+3,5)+C(x+4,5)-x^5+x-1
    C(x,5)+24*C(x+1,5)+60*C(x+2,5)+24*C(x+3,5)+C(x+4,5)-x^5+x-1

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