Bài 1: Rút gọn a)(x+3)2-(x+1)*(x-5) b)(x+1)2+2*(3*x)*(x+1)+(3-x)2 c)x2-x2*(x+1)+(3-x)3 Bài 2: Tìm x a)(3+x)2-(3x-1)2=0 b)(x+3)2-x*(3+x)=1+6x c)(4x+1)*(4x-1)-8x*(2x+1)=1 Bài 3 Chứng minh rằng biểu thức -2/3*x2+4x-20 luôn âm

31. My mother took me to the zoo yesterday

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32. Blair invented a color television in 1928.

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33. John gave me these records last week.

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34. Our club holds meetings once a month.

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35. She doesn’t find anything in that box.

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Choose the best answer.

We are looking for ____ place to spend ____ night.

Choose the best answer.

Please turn off ___ lights when you leave ___ room.

Choose the best answer.

I like _____ colorful costumes of ____ ethnic minority people in Vietnam.