x-48=(x-90)*3
    2x²+9x-42=0
    x∧2＝-1
    （8-x)(200+50x)=1750
    x+x*10% = 1000
    14x*x-12x*x*x-2=0
    2x-2x+4/3＝2
    4*x－x/3＝99
    80=10x(1-cos60)+x（1-cos30）
    80^2=7.68^2+x^2
    80=x(1-cos60)+10x(1-cos30）
    xx=4
    xx=4
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4=5
    √2x-x²=1÷3

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