0.77*a=178429.1
    x（x-6）=8
    （38－2x）×（50－2x）＝1260
    x÷35+17=x÷30-18
    x÷35+17=x÷30-18
    x÷35+17=x÷30-18
    x÷35+17=x÷30-18
    x^2+5x+1=0
    x^2-5x+1=0
    x÷35+17=x÷30-18
    2x=1.6x+0.4x
    3s^2+12s+5=0
    0.8x+0.2x=x
    40=a*3.7906+3.1045
    40=a*3.7906+3.1045
    5X=1000十2000
    5X=1000十2000
     (4/2x-3)(4/2x-3)+((8x-10)/(2x-3)-x)((8x-10)/(2x-3)-x) = 2
     (4/2x-3)^2+((8x-10)/(2x-3)-x)^2 = 2
    (4/2x-3)2+((8x-10)/(2x-3)-x)2=2

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