3x+4（25-x）＝88
    3x+（25-x）＝88
    X^2-11.7x+30=0
    200000=3693.24*((1-(1+X)^-60)/X)
    200000=3693.24*((1-(1+X)^60)/X)
    (x-4)^2=(5-2x)^2
    3x(2x+1)=4x+2
    3x(2x-1)=4x+2
    x+0.01x=20000
    (26.307+x)×2.65＝52.613+70.52-x
    0.13283/x＝0.1289/0.86289
    0.4/100.58＝x/33.4
    x+x*0.01=460000
    x^2-15.8x+61.4=0
    x/(x＋100)＝0.335
    x^2-17.1x+72.9=0
    lg(sqrt(2)k/(25sqrt(10025/10000)))=1.2
    lg(sqrt(2)k/(25sqrt(10025/10000)))
    lg(k/25)=1.2
    (153/32)b^2-33b+112=0

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