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(a+b)(a-b)=? Đây là hằng đẳng thức nào?
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(a+b)(a-b)=? Đây là hằng đẳng thức nào?

User Kanwar Malik
by
3.8k points

2 Answers

4 votes

Answer:

không

Explanation:

User Shettyh
by
3.8k points
3 votes

Answer:

(a + b)(a - b) = a² - b²

Explanation:

(a + b)(a - b) = a (a - b ) + b (a - b )

= a² - ab + ba - b² [ ab = ba ]

= a² - ab + ab - b² [ ab - ab = 0 ]

= a² - b²

User SACHIN GOYAL
by
3.3k points
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