1/x²（x－1）²
    3x^3-4x^2+4x-3=0
    （5x-2）（x+3）＝0
    x+60=90
    x^2+0.076x-0.0152=0
    180x十x∧2=3200
    96000*2x-400*96000=168000x
    （a+3)(2a-5)
    X÷0.25÷8=x－10
    x+7.5+2.6+29=50
    28+19+x+19=76+19
    (2x-1)/(x+1)
    1.74*1.15*x=4.32
    1.74*1.66*x=4.32
    tanx＝x-x∧3/12
    tanx＝x-x∧3/12
    tanx＝x-x∧3/12
    6.9*(x^2+6x+25)/(-x)/(x^2+8x+25)=1
    5x²+10x+3=0
    6.9/(-x)=(x^2+8x+25)/(x^2+6x+25)

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