Đáp án:
Giải thích các bước giải:
$(x + 2)(x - 2) = {x^2} - 2x + 2x - 4 = {x^2} - 4$
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.