48*（1-x）^2=27
    (x*(1-x^10))/(1-x)=13850/(16811.2)
    2/3*x^2+x+1=109
    1/3*x^2+x+1=109
    n*（n-1）=90
    0.19x=0.21(x-2)
    0.19x=0.24(x-2)
    （26.326+x）×0.85＝52.652+68.778-x
    （26.326+x）×0.85＝52.652+69.778-x
    （26.326+x）×0.85＝52.652+70.778-x
    （26.326+x）×0.85＝52.652+71.778-x
    （26.326+x）×0.85＝52.652+72.778-x
    （26.326+x）＝52.652+72.778-x
    (16x＾2)-(16√3)x+48＝(x＾2)-(4√3)x+16
    (4*(y+88))/5-(7*y)/(10)=100
    （x+2)(x+7)=21
    （x+2)(x+7)=14
    x^3-2x^2+x-16=0
    e^x=e^e^2
    (x*(1-x^10))/(1-x)=103500/18768

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