Đáp án:
Giải thích các bước giải: a+b=1⇒(a+b)3=13⇒a3+b3+3ab(a+b)=1
Mà : a+b=1
⇒a3+b3+3ab=1
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.