a^2+20a+4=0
    x-9÷10=1.1x-12÷12
    x-10÷10-1÷10=1.1x-12÷12
    -2y-y=3
    0.2X/0.3+0.1/0.3-0.1X/0.06-0.01/0.06=1
    0.2X+0.1/0.3-0.1X+0.01/0.06=1
    0.415x^2+9.8596x-0.415=0
    14+2x
    14+2x
    x*x*x+x=1
    9+m-1=0
    [6,x]+(6,x)=33
    6-2（x-5）=x-（x-4）
    x*1.1*3.65=2.18
    x*2.23=2.46
    -1y =6
    x*1.1*3.31=3.87
    x*1.1*2.31=3.87
    tanx＝0.8
    tanx＝0.825

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