Quốc Huy's Profile

13. Mrs. Quyen said (that) she had to buy some oranges and some pome granates.

14. Liz said (that) she was interested in the rice - cooking festival.

15. Lan said (that) she could sing English songs well.

16. Peter said (that) his sister would visit him the next week.

(X+5). (X-5) - (X+3) = 4

<=> (X^2 - 25) - (X+3) = 4

<=> X^2 - 25 - X - 3 = 4

<=> X^2 - X - 28 = 4

<=> X^2 - X = 32

<=> X. (X-1) = 32

Trường hợp 1:

X = 32

Trường hợp 2:

X - 1 = 32

X = 33

Vậy X = 32 Và X = 33.

X(2-X) + X(X-4) = 2

<=> 2X - X^2 + X^2 - 4X = 2

<=> 2X - 4X =2

<=> - 2X = 2

<=> X = -1