分解因式:(1)(2a-b)的平方+2a-b (2)2(x-1)的平方-x+1 (3)3a(x-y)-6b(y-x)
问题描述:
分解因式:(1)(2a-b)的平方+2a-b (2)2(x-1)的平方-x+1 (3)3a(x-y)-6b(y-x)
(4) (m-n)的三次方+2n(n-m)的平方(5)y(2x-y)的平方-2x(y-2x)的平方
(6)x(x+y-z)+y(x+y-z)+z(z-x-y)
答
(1)(2a-b)的平方+2a-b
=(2a-b)^2+(2a-b)
=(2a-b)(2a-b+1)
(2)2(x-1)的平方-x+1
=2(x-1)^2-(x-1)
=(x-1)[2(x-1)-1]
=(x-1)(2x-3)
(3)3a(x-y)-6b(y-x)
=3a(x-y)+6b(x-y)
=(x-y)(3a+6b)
=3(x-y)(a+2b)
(4) (m-n)的三次方+2n(n-m)的平方
=(m-n)^3+2n(m-n)^2
=(m-n)^2[(m-n)+2n]
=(m-n)^2(m+n)
(5) y(2x-y)的平方-2x(y-2x)的平方
=y(2x-y)^2-2x(2x-y)^2
=(2x-y)^2(y-2x)
(6)x (x+y-z)+y(x+y-z)+z(z-x-y)
=x(x+y-z)+y(x+y-z)-z(x+y-z)
=(x+y-z)(x+y-z)
=(x+y-z)^2