问题
填空题
等腰三角形的周长为20cm，若腰长为xcm，底边长为ycm，则它的底边长y与腰长x的关系式为______，自变量x的取值范围为______．
答案
依题意有y=20-2x，又
，2x＞20-2x 20-2x＞0
解得：5＜x＜10．
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等腰三角形的周长为20cm，若腰长为xcm，底边长为ycm，则它的底边长y与腰长x的关系式为______，自变量x的取值范围为______．
依题意有y=20-2x，又
，2x＞20-2x 20-2x＞0
解得：5＜x＜10．
| 完形填空。 | ||||
| Frank is sixty. But he looks 1 . He has a 2 sports collection. He 3 10 tennis rackets, 8 baseballs, 6 basketballs, 12 soccer balls 4 18 volleyballs. But he 5 sports. He 6 likes collecting sports things. His 7 , David, likes soccer. He is a member (成员) of a soccer 8 . He plays 9 every day with his friends. He 10 his father's collection. | ||||
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