Đáp án:
25a^2-(a-b)^2
=(5a)^2-(a-b)^2
=5a+(a-b)×5a-(a-b)
Giải thích các bước giải:
Đáp án: Ta có: 25a2−(a−b)2 =(5a)2−(a−b)2=(5a−a+b)(5a+a−b)
=(4a+b)(6a−b)
Choose the best answer.
We are looking for ____ place to spend ____ night.
Please turn off ___ lights when you leave ___ room.
I like _____ colorful costumes of ____ ethnic minority people in Vietnam.