x/(x-72)=2
    x/(x-62)=2
    -4=-0.05x²＋0.455x-2.55
    -4=-0.05x＋0.455x-2.55
    xx-7x+12=0
    (x+9)/x=4
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)=150
    2=6-m/m-2
    (1-2x)/3=(3x+1)/7-3
    1/6(3x+-6)=(2/5)x-3
    0.5x-0.7=6.5-1.3x
    4/3-8x=3-(11/2)x
    1.3x+1.25（960-x）=1288
    9x²-30x-7=0
    0.3x+0.25（960-x）=1288-960
    4-3（x-1）=x+12
    3x+3/x
    0.061= -0.0009x2 + 0.0178x + 0.1168

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