初二数学第四题
2014-04-27 · 知道合伙人教育行家
关注
展开全部
(6)169x^2-4y^2=(13x+2y)(13x-2y)
(8)49/4a^2-x^2y^2=(7/2a+xy)(7/2a-xy)
(2)49(a-b)^2-16(a+b)^2=[7(a-b)+4(a+b)]*[7(a-b)-4(a+b)]=(11a-3b)(3a-11b)
(4)(x^2+y^2)^2-x^2y^2=(x^2+y^2+xy)(x^2+y^2-xy)
(6)p^4-1=(p^2+1)(p^2-1)=(p^2+1)(p+1)(p-1)
(8)49/4a^2-x^2y^2=(7/2a+xy)(7/2a-xy)
(2)49(a-b)^2-16(a+b)^2=[7(a-b)+4(a+b)]*[7(a-b)-4(a+b)]=(11a-3b)(3a-11b)
(4)(x^2+y^2)^2-x^2y^2=(x^2+y^2+xy)(x^2+y^2-xy)
(6)p^4-1=(p^2+1)(p^2-1)=(p^2+1)(p+1)(p-1)
追答
(1)(m+n)^2-n^2=(m+n+n)(m+n-n)=m(m+2n)
(3)(2x+y)^2-(x+2y)^2=[(2x+y)+(x+2y)]*[(2x+y)-(x-2y)]=3(x+y)(x+3y)
(5)3ax^2-3ay^2=3a(x^2-y^2)=3a(x+y)(x-y)
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