s^3+0.4s^2+0.04s=6*10^(-6)
    x+√2=10√2
    x^3-50x^2+700x-2000=0
    x^2-40x+400=0
    x^3-15x^2+60x-54=0
    3/30+(3+x)/20=1
    3/30+3+x/20=1
    x^3-18x^2+78x+84=0
    x^3-180x^2+7800x+84000=0
    2/3*（x+1）＾（-1/3）=0
    20+2X=5X-44
    20+2X=5X-4
    200=-9x+520
    250=k30+520
    (x-2)^2+(-x^2-3x+2)^2=8
    (x-12.5)÷X=0.6
    (x-20)÷X=0.6
    (x-13)÷X=0.6
    (x-10)÷X=0.6
    (x-5.5)÷X=0.6

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