Giải thích các bước giải:
( a - b ) ^2 + 2ab= 8
=> ab = - 1/2
a^3 - b^3 = ( a-b)( a^2 + b^2 + ab )= 45/2
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.