Mathematics
Senior High
矢印のたすき掛けはどのように行っているのですか？
解説お願いします。
(2) (5)=(a+b)² (x²)² -2(a²+b²) x²y²+(a−b)² (12) 2
=(x²-y²){(a+b)²x² - (a - b)²y²}
=(x+y)(x-y){(a+b)x+(a−b)y}
=(x+y)(x-y)(ax+bx+ay-by) (ax+bx-ay+by)
J₂ X
{(a+b)x-(a-b)y}
1
-1
→
-(a+b)²
(a+b)2. -(a-6)²
→
-(a-b)²
(a+b)²
(a-b)²
-2(a²+62)
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