11t²+640t-1600＝0
    x*(1+152%)*(1+100%)=5.06
    20.5*（1-x^16）=5
    27x-18
    12/x-12/1.2x＝10/60
    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

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