(40+0.4x)(1+0.01x)=48.4
    （40+0.4)(1+0.01)
    （40+0.4x)(1+0.01x)
    0.5*(-7/12)^2-1.25*(-7/12)-1
    40÷4x＝5
    0.85*44X+0.15*15X=12500*0.52
    0.85*44X+0.15*15X=18014*0.52
    4*(k+1)^2-4*k*(k-1)
    x^2-4>5x+2
    44*0.85x+12*0.12x=13000*0.52
    44*0.85x+12*0.12x=18000*0.52
    42*0.85x+12*0.12x=18000*0.52
    42*0.85x+12*0.12x=13000*0.52
    3x+9=12
    -4.01e(82/-113.61)+4.26
    -80.99e(28/-53.84)+76.01
    -199.36e(25/-36.99)+214.28
    -4^2
    4--4^2
    4--4

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