phân tích đa thức thành phân tử(đặt nhân tử chung)

3x(x+1)^2-5x^2(x+1)+7(x+1)

BÀI 5:  Cho DABC. Các điểm D, E theo thứ tự thuộc các cạnh AC,AB sao cho AD=1/3AC,AE=1/3AB.Chứng minh DE//BC

Thực hiện phép tính g) (x + 2)(1 + x - x2 + x3 - x4) - (1 - x)(1 + x +x2 + x3 + x4); a) (x + 1)(1 + x - x2 + x3 - x4) - (x - 1)(1 + x + x2 + x3 + x4); b) ( 2b2 - 2 - 5b + 6b3)(3 + 3b2 - b); c) (4a - 4a4 + 2a7)(6a2 - 12 - 3a3); d) (2ab + 2a2 + b2)(2ab2 + 4a3 - 4a2b) e) (2a3 - 0,02a + 0,4a5)(0,5a6 - 0,1a2 + 0,03a4).

g) (x + 2)(1 + x - x² + x³ - x⁴) - (1 - x)(1 + x +x² + x³ + x⁴);

Exercise 7: Change into passive voice.

10. Kien will take his sister to the zoo this weekend. _________________________________________________________________.

11. Minh’s father is repairing the bike in the yard at the moment.

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12. Hoa often has her mother wash her clothes.

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13. Hung is going to make a new shirt for his mother.

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14. People said my class studied very well.

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15. My mother has bought lots of flowers to decorate my house.

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