Câu hỏi của Phạm Tuấn Long

Question

B1: Tính

1) (a+b)(a+b)

2) (a-b)(a-b)

3) (a-b)(a+b)

4) (a+b)(a+b)(a+b)

5) (a-b)(a-b)(a-b)

6) ( a+b)(a^2-ab+b^2)

7) (a-b)(a^2+ab+b^2)

Mặc Chinh Vũ · Accepted Answer

$1)\left(a+b\right)\left(a+b\right)$

$=a\left(a+b\right)+b\left(a+b\right)$

$=a^2+ab+ba+b^2$

$2)\left(a-b\right)\left(a-b\right)$

$=a\left(a-b\right)-b\left(a-b\right)$

$=a^2-ab-ba-b^2$

$3)\left(a-b\right)\left(a+b\right)$

$=a\left(a+b\right)-b\left(a+b\right)$

$=a^2+ab-ba+b^2$Câu trả lời: $1)\left(a+b\right)\left(a+b\right)$

$=a\left(a+b\right)+b\left(a+b\right)$

$=a^2+ab+ba+b^2$

$2)\left(a-b\right)\left(a-b\right)$

$=a\left(a-b\right)-b\left(a-b\right)$

$=a^2-ab-ba-b^2$

$3)\left(a-b\right)\left(a+b\right)$

$=a\left(a+b\right)-b\left(a+b\right)$

$=a^2+ab-ba+b^2$

Lê Minh Anh · Answer

1, (a+b)(a+b) = (a + b)2

2, (a-b)(a-b) = (a - b)2

3, (a-b)(a+b) = a2 - b2

4, (a+b)(a+b)(a+b) = (a +b)3

5, (a-b)(a-b)(a-b) = (a - b)3

6) ( a+b)(a2 - ab + b2) = a3 + b3

7) (a-b)(a^2+ab+b^2) = a3 - b3Câu trả lời: 1, (a+b)(a+b) = (a + b)2

2, (a-b)(a-b) = (a - b)2

3, (a-b)(a+b) = a2 - b2

4, (a+b)(a+b)(a+b) = (a +b)3

5, (a-b)(a-b)(a-b) = (a - b)3

6) ( a+b)(a2 - ab + b2) = a3 + b3

7) (a-b)(a^2+ab+b^2) = a3 - b3

Bài 3: Những hằng đẳng thức đáng nhớ