13 lines
97 B
Markdown
13 lines
97 B
Markdown
1.
|
|
$$
|
|
(a+b)*(a*b)= 2ab+a^2+b^2
|
|
$$
|
|
2.
|
|
$$
|
|
(a-b)*(a-b)=-2ab+a^2+b^2
|
|
$$
|
|
3.
|
|
$$
|
|
(a+b)*(a-b)=a^2-b^2
|
|
$$
|