exercise 5:circle the correct answers.

1.I saw / was seeing the accident when I was waiting for the taxi.

2.What were you doing / did you do when I phoned?

3.They didn't visit / weren't visiting their friends last summer holiday.

4.It rained / was raining heavily last july.

5.While people were talking to each other,he read / was reading his book.

6.Chris was eating / ate pizza every weekend last month.

bài 5 thực hiện phép tính

b,\(\dfrac{1}{x-2}+\dfrac{1}{x+2}-\dfrac{4x-4}{x^2-4}\)

d,\(\dfrac{x+3}{x^2-1}-\dfrac{x+1}{x^2-x}\)

f,\(\dfrac{1}{3x-2}-\dfrac{1}{3x+2}-\dfrac{3x-6}{4-9x^2}\)

h,\(\dfrac{1}{2x-2y}-\dfrac{1}{2x-2y}+\dfrac{y}{y^2-x^2}\)

j,\(\dfrac{1}{6x-4y}-\dfrac{1}{6x+4y}-\dfrac{3x}{4y^2-9x^2}\)

bài 4 thực hiện phép tính

b,\(\dfrac{3}{4xy}+\dfrac{5x}{2y^2}+\dfrac{7}{7yz^2}\)

d,\(\dfrac{3}{2x+6}-\dfrac{x-6}{2x^2+6x}\)

f,\(\dfrac{3x+5}{x^2-5x}+\dfrac{25-x}{25-5x}\)

h,\(\dfrac{x^2}{x^2+3x}+\dfrac{3}{x+3}+\dfrac{3}{x}\)

bài 3 thực hiện phép tính

b,\(\dfrac{x^2+9}{x-3}+\dfrac{6x}{3-x}\)

d,\(\dfrac{xy}{2x-y}-\dfrac{2x^2}{y-2x}\)

f,\(\dfrac{2x+7}{10x-2}-\dfrac{3x-8}{2-10x}\)

h,\(\dfrac{x+2}{x-1}-\dfrac{x-9}{1-x}-\dfrac{x-9}{1-x}\)

j,\(\dfrac{4-x^2}{x-3}+\dfrac{2x-2x^2}{3-x}+\dfrac{5-4x}{x-3}\)

bài 2 thực hiện phép tính

b,\(\dfrac{3+2x}{4}-\dfrac{5-6x}{4}\)

d,\(\dfrac{4x-1}{3x^2y}-\dfrac{7x-1}{3x^2y}\)

f,\(\dfrac{x^2+1}{x+2}+\dfrac{2x}{x+2}-\dfrac{1}{x+2}\)

bài 1 thực hiện phép tính

b,\(\dfrac{7-2x}{12}+\dfrac{5x-7}{12}\)

d,\(\dfrac{x+y}{3x}+\dfrac{x-2y}{3x}\)

f,\(\dfrac{5xy-4y}{2x^2y^3}+\dfrac{3xy+4y}{2x^2y^3}\)

h,\(\dfrac{2x^2+x}{x+1}+\dfrac{x-1}{x+1}+\dfrac{2-x^2}{x+1}\)