2x^2-3x+1=0
    3x1 +2x2+3x3=1 x1+2x2+3x3=3 2x1+3x2+2x3=4
    x=(10000+2000)*5/3
    60-x=√2(50-√2x)
    （1.5x+x）×3=600
    56x-（580+40x）-（56x*0.13-5x）*0.12=0
    a×0.6=13.9
    a×0.6=18.9
    a×0.6=26.8
    a×0.6=27.8
    a×0.6=19.9
    a×0.6=14.9
    -sinx-cosx-1
    -3XX+36X=120
    183.36+（7y-467.56-(7y*0.13-14-112)*0.1）*0.75-260=0
    X（X+1）=121
    x=1/1+3/10+8/9+4/5
    x=1/1+3/10+8/9+5/4
    X=12323324X
    (1-5b/12)^2+(2-5b/6+b-3/2)^2=5/2

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