Đáp án:
Giải thích các bước giải:
$2x^2(1-3x)+6x^3$
$=2x^2-6x^3+6x^3$
$=2x^2$
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.