(2x+1)(3x-5)=4x^2-1

cho tam giác ABC cân tại A cho AM là tia phân giác của góc BAC.

cho AC=5cm   AB=6cm tính diện tích abm

Tìm điều kiện của m để phương trình sau là phương trình bậc nhất:

(2m+4)x-2=0

Tìm điều kiện của m để phương trình sau là phương trình bậc nhất

 -mx+3x-2(mx-1)+27=0

IV. Choose the correct answer.

1. Does she fancy ______ a book to younger children?

A. reads B. reading C. to read D. read

2. My 6-year old brother really enjoys ___________ in the rain, which is sometimes dangerous.

A. play B. played C. playing D. plays

3. Have you ever been in such a situation _____________?

A. before B. yet C. already D. lately

4. I know she has worked much_____________ this semester than she did last semester.

A. more hardly B. hardlier C. more harder D. harder

5. They love _____________ with their friends.

A. eat out B. ate out C. having eaten D. to eat out

6. This is one of the most ridiculous things that I_____________ in my life.

A. heard B. have heard C. hear D. will hear

7.___________ is the most popular individual outdoor activity in the UK.

A. Staying indoors B. Walking C. Playing football D. Doing DIY