-x²+35x-700=0
    X/87-4/44.7-4/45-(71.7-X)/500=0.115
    X/87-4/44.7-4/45-(72-X)/500=0.115
    3000（x+10）=2500x
    tanx=(3^0.5)-1
    X/87-5/44.7-5/45-(80-X)/500=0.361
    x^3-2x-144
    36/（x+6）-18/x = 0.25x
     36/x+6-18/x = 0.25x
    36/x-18/x=0.25x
    2*x*x*x-x*x-1＝0
    X/300=X-10/200
    (t+4)(t-1)(t+1)=(t-5)(8-t)
    3t^2+6t+12=(t-2)(2-t)(t+6)
    -10x+㏑(10x+1)=0.05
    x+（x÷11.3）=79000
    5/7x:3/5x=6/7x;(x-210)
    5/7x:3/5x=6/7x;(x-210)
    5/7x:3/5x=6/7x;(x-210)
    (x^4)-(2x^2)-5

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