do/will improve

a. số học sinh xuất sắc là:

40.\(\dfrac{1}{4}\)= 10(học sinh)

b. số học sinh giỏi là:

40.\(\dfrac{2}{5}\)= 16(học sinh)

c. số học sinh đạt là:

40- (10+16)= 14(học sinh)

tỷ số % của học sinh đạt so với tổng số học sinh lớp 6A là:

\(\dfrac{14}{40}\).100=35%

=\(\dfrac{2x+1}{x\left(2x+1\right)}\)-\(\dfrac{x^2}{x\left(2x+1\right)}\)+\(\dfrac{2x^2-3x-1}{x\left(2x+1\right)}\)

= 2x+1 - x² + 2x²-3x-1

= -x + x²

(x+2)² - 2²= 0

(x+2-2)(x+2+2)=0

x+2-2=0 hoặc x+2+2=0

x=0                   x=-4

a. \(\dfrac{37}{13}\)-\(\dfrac{6}{13}\)x\(\dfrac{26}{12}\)

= \(\dfrac{37}{13}\)- 1

= \(\dfrac{37}{13}\)-\(\dfrac{13}{13}\)

= \(\dfrac{24}{13}\)

b. \(\dfrac{80}{56}\)x\(\dfrac{54}{45}\)+\(\dfrac{1}{9}\)

= \(\dfrac{12}{7}\)+\(\dfrac{1}{9}\)

= \(\dfrac{108}{63}\)+\(\dfrac{7}{63}\)

=\(\dfrac{115}{108}\)

c. \(\dfrac{9}{2}\)-\(\dfrac{5}{9}\)+ 2:\(\dfrac{3}{8}\)

=\(\dfrac{9}{2}\)-\(\dfrac{5}{9}\)+ 2 x \(\dfrac{8}{3}\)

=\(\dfrac{9}{2}\)-\(\dfrac{5}{9}\)+ \(\dfrac{16}{3}\)

= \(\dfrac{81}{18}\)-\(\dfrac{10}{18}\)+\(\dfrac{96}{18}\)

=\(\dfrac{167}{18}\)

12. she asked me when we would meet again.

13. she asked him if he was crazy.

15. he asked her if she would be at the party.

16. she asked me if i could meet her at the station.

19. he asked me if i had seen that car.

20. the mother asked the twins if they had tidied up their room.

26. she wanted to know what they were doing.

27. he wanted to know if i was going to the cinema.

28. the teacher wanted to know who spoke english.

29. she asked me how i knew that.

110. my friend asked me if Caron had talked to Kevin.

0,25

c nha

1. She asked me where her umbrella was.

2. Martin asked us how we were.

3. He asked if he had to do it.

4. the mother asked her daughter wher she had been.

5. she asked her boyfriend which dress he liked best.