(1-sin(x))/(1+sin(x))=1
    30x+70x＝2834
    3x²+6x+2=0
    3x²-6x+2=0
    （x-3.6e-14）²÷（0.065-x）＝0.00106
    x²＝0.00106×（0.065-x）
    （912-3x）5＝12（600-4x）
    x=11 x+1=10
    π/xsqrt(0.75)=1
    6.2x*x+0.62x=0.0000001
    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

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