初二的完全平方公式
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初二的完全平方公式
![](http://img.wesiedu.com/upload/a/30/a305c0baa40c4529394a657ee00f9793.jpg)
![](http://img.wesiedu.com/upload/c/73/c73931e1f33dd2bfd92baca507fb62c4.jpg)
![](http://img.wesiedu.com/upload/7/3e/73e67dada07bd7da67a65ae954ef75dd.jpg)
![](http://img.wesiedu.com/upload/3/38/3389eaad8c00227a0a3ee987d43add10.jpg)
![](http://img.wesiedu.com/upload/a/30/a305c0baa40c4529394a657ee00f9793.jpg)
![](http://img.wesiedu.com/upload/c/73/c73931e1f33dd2bfd92baca507fb62c4.jpg)
![](http://img.wesiedu.com/upload/7/3e/73e67dada07bd7da67a65ae954ef75dd.jpg)
![](http://img.wesiedu.com/upload/3/38/3389eaad8c00227a0a3ee987d43add10.jpg)
![初二的完全平方公式](/uploads/image/z/15198224-32-4.jpg?t=%E5%88%9D%E4%BA%8C%E7%9A%84%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%85%AC%E5%BC%8F)
1(1)x^2+2x+4
(2)y^2-10y+25
2(1)4x^2-20x+25
(2)x^2+4xy+4y^2
4(1)4a^2+12ab+9b^2
(2)y^2-y+1/4
5(1)x^2-4xy+4y^2
(2)m^2+6mn+9n^2
3(1)4xy
(2)x^2+2xy+y^2-1
6(1)2xy-2y^2
(2)x^2+4xy+4y^2-9
大部分都是直接得出答案的,纯手打,
再问: 6(1)2xy-2y^2 (2)x^2+4xy+4y^2-9写过程?
再答: (1)原式=(x^2-y^2)-(x-y)^2 =x^2-y^2-(x^2-2xy+y^2) =x^2-y^2-x^2+2xy-y^2 =)2xy-2y^2 (2)把x+2y看做a 原式=(a-3)(a+3) =a^2-9 =(x+2y)^2-9 =x^2+4xy+4y^2-9 懂了么?
(2)y^2-10y+25
2(1)4x^2-20x+25
(2)x^2+4xy+4y^2
4(1)4a^2+12ab+9b^2
(2)y^2-y+1/4
5(1)x^2-4xy+4y^2
(2)m^2+6mn+9n^2
3(1)4xy
(2)x^2+2xy+y^2-1
6(1)2xy-2y^2
(2)x^2+4xy+4y^2-9
大部分都是直接得出答案的,纯手打,
再问: 6(1)2xy-2y^2 (2)x^2+4xy+4y^2-9写过程?
再答: (1)原式=(x^2-y^2)-(x-y)^2 =x^2-y^2-(x^2-2xy+y^2) =x^2-y^2-x^2+2xy-y^2 =)2xy-2y^2 (2)把x+2y看做a 原式=(a-3)(a+3) =a^2-9 =(x+2y)^2-9 =x^2+4xy+4y^2-9 懂了么?