（133/(1.4*x*cos30)）+(121/(x*sin30))=1
    （133/(1.4*x*sin30)）+(121/(x*cos30))=1
    (4*a-3285)/(2*a^2-3300*a-2420000)-((4*a-3300)*(2*a^2-3285*a-2398000))/(2*a^2-3300*a-2420000)^2 =0
    1/(2a+880)^2-1/(22000-10a)^2=0
    x^2-60×x-40=0
    25.43=x/22
    (0.5×0.3)/(100+0.3a)+(0.5×0.05)/(100+0.05a)=0
    （1-x*sin30）*1.4-x*cos30=0
    2(x-2)-3(4x-1)=9(x-1)
    n+n/21.5*6=17000
    4x^3-6x^2+3x-8=0
    (m-1)(m-2)(m-3)(m-4)
    (m-1)(m-2)(m-3)(m-4)=
    (1-m)^2+(m^2-(3m)/2-3/4)^2=7/4
    √3-x^2
    x^2-10x+16=0
    78-5x=28
    50=X×50%+(500-X)×5%
    tanx-x＝0
    sinx/e∧x=sinx-xcosx

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