X=3500*1.25*1.3*1.2+100
    X=4000*1.25*(1+0.3)*(1+0.2)*(1-0.4)+100
    X=3+2
    sinx十x
    10*x∧2-14*x+3=0
    5*x∧2+10*x-2=0
    x²lnx＝1
    1/x-（1/x）^3/2
    x^2(x+1)
    5x^2-4.5x-7.2=0
    91*7666.66+5*7666.66*X=10000000
    16b^4-200b^3+833b^2-1384b+784=0
    X(X+2)=80
    2x²+10x-9=0
    2x²+10x-9=0
    x ^ 2 －8 1 x + 243 = 0
    10.61*(1-q^9)/(1-q)=43.7
    x＾3-3x＾2-3x-1＝0
    4x²－600x＋30000
    x²-2x=7

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