1. (a-b-c)(a+b-c)-(b-c-a)(b+c-a)
2. (x²+x)²-8(x²+x)+12
3. 2(x²+y²)²-8xy(x²+y²)+8x²y²
1. (a-b-c)(a+b-c)-(b-c-a)(b+c-a)
2. (x²+x)²-8(x²+x)+12
3. 2(x²+y²)²-8xy(x²+y²)+8x²y²
你下面的答案…………1
2(m-n)²
2
(a-4)(a+3)
3
(m-1)(m+1)(p-q)
1、= (a-b-c)(a+b-c)+(b-c-a)(a-b-c)
=(a-b-c)(a+b-c+b-c-a)
=2(a-b-c)(b-c)
2、
=(x²+x-4)2-4
=( x²+x-4+2)( x²+x-4-2)
=( x²+x-2)( x²+x-6)
=(x+2)(x-1)(x+3)(x-2)
3、=2【(x²+y²)²-4xy(x²+y²)+4x²y²】
=2(x²+y²-2xy)2
=2(x-y)4