配套习题- 如何灵活应用完全平方公式解题 -【青果学院】

1/5单选题

难度：

1.下列计算正确的是（）

A	（x +y）²=x²+y²
B	（x-y）²=x²-2xy-y²
C	（x+2y）（x-2y）=x²-2y²
D	（-x +y）²=x²-2xy+y²

正确答案：RA==

6Kej77yaQeOAge+8iHgree+8iTxzdXA+Mjwvc3VwPj14PHN1cD4yPC9zdXA+KzJ4eSt5PHN1cD4yPC9zdXA+77yM5pys6YCJ6aG56ZSZ6K+v77ybPGJyPkLjgIHvvIh4LXnvvIk8c3VwPjI8L3N1cD49eDxzdXA+Mjwvc3VwPi0yeHkreTxzdXA+Mjwvc3VwPu+8jOacrOmAiemhuemUmeivr++8mzxicj5D44CB77yIeCsyee+8ie+8iHgtMnnvvIk9eDxzdXA+Mjwvc3VwPi00eTxzdXA+Mjwvc3VwPu+8jOacrOmAiemhuemUmeivr++8mzxicj5E44CB77yILXgree+8iTxzdXA+Mjwvc3VwPj3vvIh4LXnvvIk8c3VwPjI8L3N1cD49eDxzdXA+Mjwvc3VwPi0yeHkreTxzdXA+Mjwvc3VwPu+8jOato+ehri4gPGJyPuaVhemAiUQuIA==

2/5单选题

难度：

2.若m+ n=3，则2m²+4mn+2n²-6的值为（　　）

A	12
B	6
C	3
D	0

正确答案：QQ==

6Kej77ya5Y6f5byPPTLvvIhtPHN1cD4yPC9zdXA+KzJtbituPHN1cD4yPC9zdXA+77yJLTbvvIw8YnI+PTLvvIhtKyBu77yJPHN1cD4yPC9zdXA+LTbvvIw8YnI+PTLDlzktNu+8jDxicj49MTIuIDxicj7mlYXpgIlBLiA=

3/5单选题

难度：

3.如果x+

＝2，则x²+

=（　　）

A	4
B	2
C	0
D	6

正确答案：Qg==

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

4/5单选题

难度：

4.已知（m+ n）²=25，（m-n）²=9，则m

n与m²+n²的值分别为（　　）

A	4，17
B	3，16
C	5，34
D	6，18

正确答案：QQ==

6Kej77ya4oi177yIbStu77yJPHN1cD4yPC9zdXA+PTI177yM77yIbS1u77yJPHN1cD4yPC9zdXA+PTnvvIw8YnI+4oi0bTxzdXA+Mjwvc3VwPisybW4rbjxzdXA+Mjwvc3VwPj0yNeKRoO+8jG08c3VwPjI8L3N1cD4tMm1uK248c3VwPjI8L3N1cD49OeKRoe+8jDxicj7ikaAt4pGh5b6XNG1uPTE277yMPGJyPuKItG1uPTTvvIw8YnI+4oi0bTxzdXA+Mjwvc3VwPituPHN1cD4yPC9zdXA+PTI1LTJtbj0yNS0yw5c0PTE3LiA8YnI+5pWF6YCJQS4g

5/5单选题

难度：

5.如果多项式p=a²+2b²+2a+4b+2014，则p的最小值是（　　）

A	2010
B	2011
C	2012
D	2013

正确答案：Qg==

6Kej77yacD1hPHN1cD4yPC9zdXA+KzJiPHN1cD4yPC9zdXA+KzJhKzRiKzIwMTTvvIw8YnI+Pe+8iGE8c3VwPjI8L3N1cD4rMmErMe+8iSvvvIgyYjxzdXA+Mjwvc3VwPis0Yisy77yJKzIwMTHvvIw8YnI+Pe+8iGErMe+8iTxzdXA+Mjwvc3VwPisy77yIYisx77yJPHN1cD4yPC9zdXA+KzIwMTHvvIw8YnI+5b2T77yIYSsx77yJPHN1cD4yPC9zdXA+PTDvvIzvvIhiKzHvvIk8c3VwPjI8L3N1cD49MOaXtu+8jHDmnInmnIDlsI/lgLzvvIw8YnI+5pyA5bCP5YC85pyA5bCP5Li6MjAxMS4gPGJyPuaVhemAiTxiPkI8L2I+LiA=