问题
填空题
请写出一个当x＞2时，函数值y随自变量x增大而减小的函数______．
答案
因为当x＞2时，y随x增大而减小，所以，对称轴为x=2；
满足条件的二次函数关系式为y=-（x-2）2．
故答案为：y=-（x-2）2不唯一．
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请写出一个当x＞2时，函数值y随自变量x增大而减小的函数______．
因为当x＞2时，y随x增大而减小，所以，对称轴为x=2；
满足条件的二次函数关系式为y=-（x-2）2．
故答案为：y=-（x-2）2不唯一．
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| The Pecan Thief When I was six years old, I was visiting my grandfather' s farm in Kansas.Grandpa had sent me into the 1 to gather pecans for us to enjoy later.  Pecan picking was really 2 work and my little basket was only  half full.I wasn' t about to_3_ Grandpa down.Just then something caught my 4 . A large brown squirrel was a few feet away.I watched as he picked up a pecan, hurried to a tree and 5 in a large hole in the trunk.A moment later the squirrel 6 out and climbed down to the ground to pick up another nut.Once again, he took the pecan back to his hiding place. Not so 7 anymore, I thought.I dashed over to the tree and looked into the hole.It was 8 with pecans!Golden pecans were right there for taking.This was my 9 . Handful by handful, I scooped all of those pecans into my basket.Now it was full! I was so 10 of myself.I couldn' t wait to show Grandpa all the pecans. 11 , I ran back and shouted, "Look at all the pecans!" He looked into the basket and said, "Well, well, how did you find so many?" I told him how I' d 12 the squirrel and taken the pecans from his hiding place. Grandpa congratulated me on how smart I' d been in observing the squirrel and his habits.Then he did something that 13 me.He handed the basket back to me and put his arm gently 14 my shoulders. "That squirrel worked very hard to gather his winter 15 of food, " he said."Now that all of his pecans are gone, don' t you think that little squirrel will 16 the cold winter?" "I didn't think about that, " I said. "I know, " Grandpa said."But a good man should never take 17 of someone else' s hard work." Suddenly I felt a bit 18 .The image of the starving squirrel wouldn't 19 my mind.There was only one thing I could do.I carried the basket back to the tree and poured all the nuts into the hole. I didn't eat any pecans that night, but I had something much more filling-the 20 of knowing I had done just the right thing. | ||||
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