x2-2x+255=0
     x^3- 5x^2+ 10x = 80
    arccotx
    (4-x)(5-x)=8,(4-x)²+(5-x)²
    （9943-X）/X=0.55
    （9943-X）/X=0.55
    50+x+x-1+x-2+33=225
    -3x+4=7x+24
    （4-x）（5-x）=8
    （4-x）（5-x）=8
    xx-9x+20=8
    80+xx=32x
    x^3-x+14
    x^3-x+14
    X 3-x+14
    8x^3-6x+1=0
    300x-10x^=2000
    300x-10x^=2000
    3x-17=7
    60000÷x＋4＝60000÷（x＋500）

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