1.5（20-a）+1.2×（30+1.5a）=69
    1.5（20-a）+1.2×1.5a=69
    42x÷（10.5×0.3）+36.7=74.5x
    42x/（10.5×0.3）+36.7=74.5x
    3x²－50x＝57
    (5/12x+4)/(x+4)=6/13
    cosx=0.866183111111111111
    cosx=0.258666666666666666
    sinx=0.965966643086
    sinx=0.965966643086
    x+x＾2+x＾2=1
    40+4p=-p+50
    a×0.6=25.9
    a×0.6=24.9
    a×0.6=32.9
    a×0.6=24.9
    50-5P=-10+5P
    2/1-x=10
    27n＋81n×n＝6808
    (27.95-y)+y+19.32=63.53

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