Đáp án:
Giải thích các bước giải:
(4x-8y)Al +6xFe2O3=>(2x-4y)Al2O3 +12FexOy
(4x-8y/3)Al +2xFe2O3-->(2x-4y/3)Al2O3 +4FexOy
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.