2^4-x=64

1/2.2^x+2.2^x=9.2^6

1.Rút gọn các biểu thức:
a) (3x-2y)^2+(x-2y)^2
b) (2x-3)^2-(2x+1).(2x-1)

PASSAGE 2

Homeopathy

            Homeopathy (1) _______ to have gained a lot more respectability in society than a number of GPs believe it really deserves. (2) _______there being no evidence that it is effective, according to a recent UK government report, many prominent people (3)_______to support it. In view of this, perhaps the most surprising fact of all is that homeopathy is offered (4)_______treatment on the NHS (National Health Service) in the UK. Like many other alternative forms of medicine, homeopathy has become so accepted (5)_______there are few who question its use. People have become (6)_______to seeing homeopathy as a treatment for illness and disease. However, many researchers insist (7)_______claiming that it is not a valid treatment because the medicines contain no active ingredients.

            The real question is why it is so popular. Many patients swear that was an effective cure for their disease whilst the report maintains this is simply (8)_______to the placebo effect. In other words, just the act of taking the medicine is a good enough reason for patients to (9)_______feeling better. In short, while homeopathy many be useful for helping people get over minor illnesses, it is (10)_______that anyone with serious illnesses should seek out conventional treatment.

1.                  A. feels           B. suggests    C. seems        D. shows

2.                  A. Except       B. Although   C. However   D. Despite

3.                  A. maintain   B. keep           C. carry          D. continue

4.                  A. as               B. from           C. on               D. to

5.                  A. until           B. that             C. enough      D. when

6.                  A. accustomed          B. familiar      C. acquainted            D. fond

7.                  A. for              B. on   C. by   D. in

8.                  A. due                       B. up    C. result         D. because

9.                   A. have          B. start            C. get  D. become

10.              A. regarded   B. referred     C. recovered  D. recommended    

CMR: Nếu tam giác ABC có AB=AC thì:

a,  Phân giác góc A vuông góc với BC

b, Đường thẳng Ax vuông góc với BC là tia phân giác của góc A

1 ca nô xuôi dòng từ bến a đến bến b hết 2h, ngược dòng từ bến b về bến a hết 5h. hỏi 1 cụm bèo trôi theo dòng nước từ bến a đến bến b hết bao lâu