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(ay+bx)^3+(ax+by)^3-(a^3+b^3)(x^3+y^3)怎么因式分解?
题目详情
(ay+bx)^3+(ax+by)^3-(a^3+b^3)(x^3+y^3)怎么因式分解?
▼优质解答
答案和解析
(ay+bx)^3+(ax+by)^3-(a^3+b^3)(x^3+y^3)
=(ay+bx+ax+by)[(ay+bx)²-(ay+bx)(ax+by)+(ax+by)²]-
-(a+b)(a²-ab+b²)(x+y)(x²-xy+y²)
=(a+b)(x+y)[(ay+bx)²-(ay+bx)(ax+by)+(ax+by)²]-
-(a+b)(x+y)(a²-ab+b²)(x²-xy+y²)
=(a+b)(x+y)[(ay+bx)²-(ay+bx)(ax+by)+(ax+by)²-(a²-ab+b²)(x²-xy+y²)]
=3abxy(a+b)(x+y).
=(ay+bx+ax+by)[(ay+bx)²-(ay+bx)(ax+by)+(ax+by)²]-
-(a+b)(a²-ab+b²)(x+y)(x²-xy+y²)
=(a+b)(x+y)[(ay+bx)²-(ay+bx)(ax+by)+(ax+by)²]-
-(a+b)(x+y)(a²-ab+b²)(x²-xy+y²)
=(a+b)(x+y)[(ay+bx)²-(ay+bx)(ax+by)+(ax+by)²-(a²-ab+b²)(x²-xy+y²)]
=3abxy(a+b)(x+y).
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