x²-120x-5300=0
    x²-120x-15300=0
    5.4289*（28+1241.9/（3.1415926*x）） = (（700-40000/(3.1415926*x))^2
    5.4289*（28+1241.9/（3.1415926*x））=（700-40000/(（3，1415926*x）^2))
    5.4289=x
    x^3-100x-24000=0
    100—（x+2）➗4=90
    （x+135）/x=251.2/182.12
    x=-lnx
     x-sin2x=3π/2
    x/x+366＝0.266％
    x-sin2x=3π/2
    1/6x+1/7x+1/12x+9=x
    X^2+(5-4X)^2-4X+6(5-4X)-4=0
    (5-4X)^2
    （1+X）^4*（0.08+X）^4=1.1041
    5000×K×50%－5000×K×15%－5000×（1＋K）×8%×20%＝0
    1750X－80＋80X＝0
    980=80÷x＋80÷x∧2+80÷x∧3+80÷x∧4+1080÷x∧5
    1500/1500+X*6%+X/1500+X*16%=13.09%

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