11730x^2-39659130x+2983000000
    x×x+x-16=0
    4÷（x×(x×x+1)½）=1
    57.3x+arctanx=90
    x^{(x-1)^2}=2x-1
    1.35*0.0098*（3199.75-300-H）+1.50*300*0.0098+1.02*300*0.0098+1.20*0.0098*（H-300）+2.5=42.43
    13.8×200×x×(400-x÷2)＝145000000
    x^2－920x＋1050725＝0
    X∧2－920X＋1050725＝0
    x/(sqrt(1+3)*sqrt(1+4*3)*sqrt(1+0.75))=1
    x^2-11.9x+35.3=0
    X(6-X)=5
    （30-Y)(72+3Y)=2160
    80（1+x）（1+x）=72
    3/4x^2+41/25x-4=0
    (58-x)/ln((90-x)/32)=46.3
    46.3*lnx-x=128.5
     1/(1+x²)
    12x²+10x-250＝0
    x-1824=3.5539x^(2/3)

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