x+（x/11.3）=99400
    250x等于440
    0.216125x-0.382552x^2+0.652994x^3-0.382487x^4+0.074056x^5=0.276
    0.01(43.225x-15.302083x^2+5.223958x^3-0.611979x^4+0.023698x^5)=2.76
    (6-x)^2+(((2√3)/3)x-2√3)^2+x^2=((√3/3)x-√3)^2
    (6-x)^2+(((2√3)/3)x-2√3)^2+((√3/3)x-√3)^2=x^2
    （x-70）[20+2（110-x）]=1200
    （x-70）[20+220-2x]7=1200
    (X-X/1.13*0.13)/7.29=0.318
    (X-X/1.13*0.13)/7.29=0.0728
    x^2-0.71x+0.0167=0
    5X÷5=55÷5
    x^6-8*x^5-32*x^4-128*x^3+240*x^2-256=0
    lnx-x+1=0.001
    xlnx-x+1=-0.001
    20-0.5L-50/L=20-L
    (70+x)(10x+7)+x*x*x*x*x*x=2008
    (7*10+x)(10x+7)+x^6=2008
    ((-3-0.4280863a)-(-2+0.9037378a))/((-3-0.4280863a)^2+(-2+0.9037378a)^2+2)=0
    4-x²=（2+x）²-2

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