(cosX)^2-0.5X^2 = 0
    (cosX)^2-0.5X^2 = 0
    (cosX)^2-4X^2＝0
    0.0197x+8.2528＝-0.2202x^2-0.751x+27.865
    80y-15×（6750-25y）÷120等于550
    2+x=10
    x-4/9+5/9=2
    11x²-7x-6
    0.2+0.8x/125+((0.8x-0.2)/42)^2+（x/370)^2=1
    x－4－2lnx
    (0.01*A)/(1+0.01*A)=0.15
    (0.01*A)/(1+0.01*A)=15
    (0.01*A)/(1+0.01*A)=1
    0.75a^2+59a/7
    A=0.15*(100+A)
    (0.01*A)/(1+0.01*A)=0.15
    (0.01*A)/(1+0.01*A)=0.1304
    (0.01*A)/(1+0.01*A)=15
    (0.01*X)/(1+0.01*X)=15
    (0.01*20)/(1+0.01*20)=A

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