计算.(x+y)(x-2y)-(2y-x)(-x-2y)(a+1/2b)(a-1...
计算.(x+y)(x-2y)-(2y-x)(-x-2y)(a+1/2b)(a-1/2b)-(3a-3b)(3a+xb)(3x-y)(3x+y)-y(x-y)...
计算.(x+y)(x-2y)-(2y-x)(-x-2y) (a+1/2b)(a-1/2b)-(3a-3b)(3a+xb) (3x-y)(3x+y)-y(x-y)
展开
展开全部
您好:
.(x+y)(x-2y)-(2y-x)(-x-2y)
=.(x+y)(x-2y)+(2y-x)(x+2y)
=x²-xy-2y²+4y²-x²
=2y²-xy
(a+1/2b)(a-1/2b)-(3a-3b)(3a+3b)
=a²-1/4b²-9a²+9b²
=35/4b²-8a²
(3x-y)(3x+y)-y(x-y)
=9x²-y²-xy+y²
=9x²-xy
不明白,可以追问如有帮助,记得采纳,谢谢
祝学习进步!
.(x+y)(x-2y)-(2y-x)(-x-2y)
=.(x+y)(x-2y)+(2y-x)(x+2y)
=x²-xy-2y²+4y²-x²
=2y²-xy
(a+1/2b)(a-1/2b)-(3a-3b)(3a+3b)
=a²-1/4b²-9a²+9b²
=35/4b²-8a²
(3x-y)(3x+y)-y(x-y)
=9x²-y²-xy+y²
=9x²-xy
不明白,可以追问如有帮助,记得采纳,谢谢
祝学习进步!
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询