x＋5＝5
    （20t-90）²+（30√3）²=【60（t-2）】²
    (9535+40+x)*（4.69%+1.25%）=4x
    (9535+40+x)*（4.69%+1.8%）=4x
    (9535+40+157.95)x=4*157.95
    (9535+40+x)*1.8%*4.69125%=4x
    (9535+40+x)*1.8%=4x
    (2x²-9)(2x²-1)
    2*d*d*d+15*d*d+24*d+8=0
    （s+4)*(3*s*s+6*s+2)-s*(s+1)*(s+2)=0
    x^4－5x²+9/4=0
    （30-2x）×（20-x）＝78×6
    x4－5x²+9/4=0
    （x+1）^2+2=0
    x^2-60x-9600=0
    （x-40）［（60-x）×20+300］=6080
    （x-40）［（60-40-x）×20+300］=6080
    5（1+x）²=7.2
    (1+1/x)*e^(-1/x)=0.1758
    4a^2+4.93246a-1.02273=0

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