38584*（0.2x+0.5）+1201*（0.8x-2）+18256x+44638*（0.2x+0.8x*1.3）=800000
    5293=4980*（1+x）
    （260*63-x）*0.95=13563.15
    1/2x^1/2
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*215/x*0.35805183739485175)^0.055)=7.94/x
    2/3*((1-1/0.06)+(3/4+1/0.06)*(1/3*215/x*0.35805183739485175)^0.06)=7.94/x
    X=1-1%
    V=77062500-0.03V-59859223-3853125-2311875
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*220/x*0.35805183739485175)^0.05)=8.398/x
    3x^3-2x^2-x+4 =0
    (e^x)(-x-2)=0
    √x^2+2^2=4-x
    3x^2+11x-8=0
    sin(3x+2)=x-1
    x²－x＋1
    60/x-90/x=-3
    x:8=875%
    4:20=x/3
    0.2=4:x
    41.80x^2-114.32x-257.57=0

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