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    x+x^2=6.25
    13xx+16x-20=0
    1×(-18-12)-a(6×a+12)+(-3×(2a+6))=0
    -30-6A^2-12A-6A-18=0
    a^2=1
    b^2+3*b=54
    b^2+3*b=56
    x^3+2x-1
    (5x+10):(x+10)=5:2
    (X-6)/(7-6)=(4.5-4.355)/(4.868-4.355)
    104减(X+3)乘4=90
    (x-300)*0.78+x-300=x*0.88
    tanx-x=0.76
    tanx-x=0.55
    138x^2-120060x+14500000=0
    x²+x-1.5=0
    500000/X=8
    X+X*8%+X*9%=15269.9
    7.1x∧2+11.6x=5050
    7.1x∧2=1

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