原式=2[(x+y)^2-4(x-y)^2]
=2(x+y+2x-2y)(x+y-2x+2y)
=2(3x-y)(-x+3y)
=2(-3x^2+10xy-3y^2)
=-6x^2+20xy-6y^2
猜你喜欢
- 1简便算：8.68-8.68/0.56*0.5
- 2说某某的含量是多少ppm时,ppm是个什么单位啊?
- 3分解因式:ax的平方减9a
- 4求定积分的导数
- 5"记得,记住''的英语单词怎么拼?
- 6标况下,11.2升得SO3所含的分子数是0.5NA.这个错了WHY
- 7the hero in my heart英文作文
- 8就古希腊文明的形成过程及其历史特殊性和历史影响请你加以评述~
- 9I will avoid gossip,jealousy,and negative thinking.Most people do not think about what they think about.Today,I will mak
- 10英语翻译