（26.274+x）×2.95＝52.549+71.623-x
    （26.274+x）×2.75＝52.549+71.623-x
    （26.274+x）×2.55＝52.549+71.623-x
    （26.274+x）×2.35＝52.549+71.623-x
    cosx/x²+1
    （x-190.972）*10-2=2
    （x-190.972）*10-2=1
    84.1 = 37.717ln(x) - 10.294
    50= 37.717ln(x) - 10.294
    84.1 = 38.56ln(x) - 11.728
    50 = 38.56ln(x) - 11.728
    x×0.5%＝550
    9(x-1)(x-1)-4(2-3x）（2-3x）=0
    9(x-1)(x-1)-4(2-3x）（2-3）=0
    x+3=-3{x-3}
    x+3=-3
    x^3=10
    x+15=2x-28
    x+15=x-28
    2.224=1.5t+2cost

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