问题
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方程（x-1）（x-2）=0的两根为x1，x2，且x1>x2，则x1-2x2=（ ）。
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方程（x-1）（x-2）=0的两根为x1，x2，且x1>x2，则x1-2x2=（ ）。
0
My friends and I had just finished lunch at a hotel when it started to rain heavily. When it became lighter, I decided to get my 1 which was parked at my office three streets away. My friends 2 that I shouldn’t go, mainly because I was seven months pregnant (怀孕的) then. I promised that I’d be very 3 . One of them wanted to come with me but I insisted that she stayed with another friend who needed help 4 her baby. I walked out of the hotel and started making my way to the car. At the crossing, a van stopped and a man came out with an umbrella. Before I knew what was happening, he walked right 5 me and told me he’d escort (护送) me. Although I refused, he insisted that he would. During our walk, he kept telling me to walk slower, as the ground was 6 . When we got to the car-park, I thanked him and he went away. I did not get his name and can 7 recognize (认出) him now. Did he stop for me? I’ll never know. So how did I pay it forward? I was at home when I noticed two Indian workers 8 in the heavy rain. They were probably on their way to the working place near my home. I went out and passed them my 9 , telling them they should take and keep it. They were surprised by my action. They were very grateful to me, probably 10 why a stranger was offering such kindness. I was so relaxed and happy that day.
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