（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
    n^2+(2n-12n/5+12/5-3/2)^2=5/2
    n^2+(2n-12n/5+5/12)
    (x+16)x＝1161
    （20+2x)(15+2x)-15×20＝246

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