x²－5＝0
    (x-2)+x-1=3
    x
    a-（a×0.3）＝326
    (20-x）（100+10x)=2240
    x*x*lnx
    e^x+2/x
    1.65*12x-1.5*10x=660
    6x/5=1
    -2t²+2.4t=0.7
    －3t²+2.4t=0.7
    72000000/x/100=3000
    49x²＋36x－36＝0
    72÷x÷100=1000
    x+1/x=3
    x+1/x=0
    (20-x）（100+10x)=2240
    x ^2-10x-204=0
    x ^2-10x+204=0
    x^2+45x-20=0

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