de luyen tap so 1 hk i 12

... part in different after school activities. Some students play sports. They often play soccer, table tennis or badminton. Sometimes they go swimming in the swimming pools. Some students like music, ... apartment rooms everything not bathroom comfortable really Minh lives in a lovely (1) ....................... in Ho Chi Minh city. His apartment is (2) ................ very big but it is very (3) ..................... ... The kitchen is very modern. There are (7) ..................... in the kitchen: refrigerator, washing machine, dishwasher, gas cooker, electric stove, kitchen table, ... . Minh’s bedroom isn’t...

... đó I = ∫ 8 dt =  24 + 8  1 1   0,50 = 11 . 6 0,25 2 Chứng minh bất đẳng thức (1, 00 i m) yz ( y + z) 2 Ta có x + y + z = ≤ ⇔ 12 x 2 + 12 ( y + z) x ≤ ( y + z) 2 3x 12 x 2 ⇔ 12  x  + 12 . ... x − π =  = 1 . Câu II (2 i m) 1. Gi i phương trình 2  3   6  2     2. Gi i phương trình 10 x + 1 + 3x − 5 = 9 x + 4 + 2 x − 2 (x ∈  ). Câu III (2 i m) Trong không gian v i hệ tọa độ ... (1) . Vì x ≥ 5 nên cả hai vế của (1) đều dương. Do đó: 3 (1) ⇔ 12 x − 1 − 2 (10 x + 1) (2 x − 2) = 12 x 1 − 2 (9 x + 4)(3x − 5) 0,50 ⇔ 7 x 2 − 15 x − 18 = 0 ⇔ x = 3 hay x = − 6 . 7 Kết hợp với...