5+2lgx=4.9
    x*x-108x+288=0
    x2-108x+288=0
    3x²-x-2=0
    j=0
    a²-4a=0
    2x²+3x+4=0
    16a^4-140a^3+529a^2-956a+760=0
    16b^4-140b^3+529b^2-956b+760=0
    750x/1+x-30x
    x^2+2x+3＝0
    ㏒e（a）=－a－1
    40*120+40*1/10x*80%*90-120*20-90*30
    x²+5=0
    (2x-1)/3-(x+5)/6=2x+1
    4x-2-x-5=12x+6
    1/2x=2x-1/6
    (2x-1)/3-(x+5)/6=2x-1
    120+450x=100+500x
    (1.5x-1)/3-x/0.6=1.5

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