TK

TRONG SBT TOÀN BÀI DỄ CHỨ NHỈ :33

6. doesn't phone /will leave

7. don't study/won't pass

8. rains / won't have to water 

9. won't be able / watch

10. couldn't move / wasn't

11. study/ will pass

12. shines/will walk

13. has/will see

14. came/would be

15. earn/will fly

16. travel/will visit

17. wear/will slip

18. forgets/will give

19. go/will listen

6. doesn't phone /will leave

7. don't study/won't pass

8. rains / won't have to water 

9. won't be able / watch

10. couldn't move / wasn't

11. study/ will pass

12. shines/will walk

13. has/will see

14. came/would be

15. earn/will fly

16. travel/will visit

17. wear/will slip

18. forgets/will give

19. go/will listen

2a. Diện tích xung quanh của hình hộp chữ nhật là:

\(\left(2,6+1,8\right)\text{×}2\text{×}1,5=13,2\left(m^2\right)\)

2b. Diện tích toàn phần của hình hộp chữ nhật là:

\(13,2+\left(2,6\text{×}1,8\right)\text{×}2=22,56\left(m^2\right)\)

2c. Thể tích của hình hộp chữ nhật là:

\(2,6\text{×}1,8\text{×}1,5=7,02\left(m^3\right)\)

S xung quang là : \(\left(1,8+2,6\right)\times2\times1,5=13,2\left(m^2\right)\)

S toàn phần là : \(13,2+\left[\left(1,8\times2,6\right)\times2\right]=22,56\left(m^2\right)\)

Thể tích là : \(1,5\times1,8\times2,6=7,02\left(m^3\right)\)

a: Xét ΔBAH vuông tại A và ΔBDH vuông tại D có

BH chung

\(\widehat{ABH}=\widehat{DBH}\)

Do đó: ΔBAH=ΔBDH

400m2=400m2

1: \(\dfrac{15x}{7y^3}\cdot\dfrac{2y^2}{x^2}\)

\(=\dfrac{15x\cdot2y^2}{7y^3\cdot x^2}=\dfrac{30xy^2}{7x^2y^3}=\dfrac{30}{7xy}\)

2: \(\dfrac{6x^3}{7y^4}\cdot\dfrac{35y^2}{24x}\)

\(=\dfrac{6x^3}{24x}\cdot\dfrac{35y^2}{7y^4}\)

\(=\dfrac{x^2}{4}\cdot\dfrac{5}{y^2}=\dfrac{5x^2}{4y^2}\)

3: \(\dfrac{4y^2}{x^4}\cdot\dfrac{-3x^2}{8y}\)

\(=\dfrac{4y^2}{8y}\cdot\dfrac{-3x^2}{x^4}=\dfrac{y}{2}\cdot\dfrac{-3}{x^2}=\dfrac{-3y}{2x^2}\)

4: \(\dfrac{-18y^3}{25x^4}:\dfrac{9y^3}{-15x^2}\)

\(=\dfrac{18y^3}{25x^4}\cdot\dfrac{15x^2}{9y^3}\)

\(=\dfrac{18y^3}{9y^3}\cdot\dfrac{15x^2}{25x^4}=2\cdot\dfrac{3}{5x^2}=\dfrac{6}{5x^2}\)

5: \(\dfrac{8y^2}{9x^2}:\dfrac{4y}{3x^2}\)

\(=\dfrac{8y^2}{9x^2}\cdot\dfrac{3x^2}{4y}=\dfrac{8y^2}{4y}\cdot\dfrac{3x^2}{9x^2}=\dfrac{1}{3}\cdot2y=\dfrac{2y}{3}\)

6: \(\dfrac{-20x}{3y^2}:\dfrac{-4x^3}{5y}\)

\(=\dfrac{20x}{3y^2}:\dfrac{4x^3}{5y}\)

\(=\dfrac{20x}{3y^2}\cdot\dfrac{5y}{4x^3}=\dfrac{20x}{4x^3}\cdot\dfrac{5y}{3y^2}=\dfrac{5}{3y}\cdot\dfrac{5}{x^2}=\dfrac{25}{3x^2y}\)

7: \(\dfrac{\left(x+4\right)^2}{4x+12}:\dfrac{x+4}{3x+9}\)

\(=\dfrac{\left(x+4\right)^2}{4\left(x+3\right)}:\dfrac{x+4}{3\left(x+3\right)}\)

\(=\dfrac{\left(x+4\right)^2}{4\left(x+3\right)}\cdot\dfrac{3\left(x+3\right)}{x+4}=\dfrac{3\left(x+4\right)}{4}\)

8: \(\dfrac{5x+10}{4x-8}\cdot\dfrac{4-2x}{x+2}\)

\(=\dfrac{5\left(x+2\right)}{4\left(x-2\right)}\cdot\dfrac{-2\left(x-2\right)}{x+2}\)

\(=\dfrac{5\cdot\left(-2\right)}{4}=-\dfrac{10}{4}=-\dfrac{5}{2}\)

9: \(\dfrac{x^2-36}{2x+10}\cdot\dfrac{3}{6-x}\)

\(=\dfrac{\left(x-6\right)\left(x+6\right)}{2\left(x+5\right)}\cdot\dfrac{-3}{x-6}\)

\(=\dfrac{-3\left(x+6\right)}{2\left(x+5\right)}\)

10: \(\dfrac{x^2-4}{x^2-x}:\dfrac{x^2+2x}{x-1}\)

\(=\dfrac{\left(x-2\right)\left(x+2\right)}{x\left(x-1\right)}\cdot\dfrac{x-1}{x\left(x+2\right)}\)

\(=\dfrac{\left(x-2\right)}{x^2\left(x+2\right)}\)

1 when

2 how many

3 which 

4 who

5 why

1 what is on television tonight

2 who is your favorite MC television ?

3 how much time does tina spend watching 

4 why do they like to watch cartoons ?

5 what do you like best television programme