Đáp án:
Giải thích các bước giải: = x²(y ² -1)+8(x-2)
=x²y²-x²+8x-16
=(xy) ²-(x ² -8x+16)
=(xy) ²-(x-4) ²
=(xy-(x-4))(xy+x-4)
=(xy-x+4)(xy+x-4)
Choose the best answer.
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Please turn off ___ lights when you leave ___ room.
I like _____ colorful costumes of ____ ethnic minority people in Vietnam.