12x^6+12x^5+12x^4+12x^3+12x^2+12x^1=18
    500/(x-25)+30(x-25)/x=30
    （25－X（300－30x）＝6300
    x3+21/100x+11/200=0
    0.2x+30=0.5x
    26*100/X/1.05/90*100=42
    49*100/X/1.05/90*100=78
    23*100/X/1.05/90*100=42
    23*100/X/1.05/90*100=43
    68*100/X/1.05/90*100=200
    57*100/X/1.05/90*100=101
    99*100/X/1.05/90*100=176
    90*100/X/1.05/90*100=176
    5.94×100000000000000000＝（0.02-2x）²÷x（0.02＋2x）
    109*100/X/1.05/90*100=176
    0.75=18/x
    113*100/X/1.05/90*100=200
    15:20=x
    54*100/X/1.05/90*100=78
    30*100/X/1.05/90*100=48

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