1) 5 + (-4) = 1

2) (-8) + 2 = -6

3) 8 + (-2) = 6

4) 11 + (-3) = 8

5) (-11) + 2 = -9

6) (-7) + 3 = -4

7) (-5) + 5 = 0

8) 11 + (-12) = -1

9) (-18) + 20 = 2

10) (15) + (-12) = 3

11) (-17) + 17 = 0

12) 16 + (-2) = 14

13) (30) + (-14) = 16

14) (-19) + 20 = 1

15) (-18) + 15 = -3

16) (10) + (-6) = 4

17) (-28) + 14 = -14

18) 15 + (-30) = -15

19) (15) + (-4) = 11

20) (-21) + 11 = -10

21) 8 + (-22) = -14

22) (-15) + 4 = -11

23) (-3) + 2 = -1

24) 17 + (-14) = 3

25) 17 + (-14) = 3

thế này đọc đc mới đỉnh

\(\left(-\dfrac{5}{4}\right).\dfrac{7}{9}+\left(-\dfrac{5}{4}\right).\dfrac{2}{9}=\left(-\dfrac{5}{4}\right).\left(\dfrac{7}{9}+\dfrac{2}{9}\right)=\left(-\dfrac{5}{4}\right).1=-\dfrac{5}{4}\)

-5/4

\(=\dfrac{\sqrt{5}-2}{5-4}-\sqrt{\left(\sqrt{5}+2\right)^2}=\sqrt{5}-2-\sqrt{5}-2=-4\)

4 x 5 + 10 = 20 + 10 = 30

3 x 9 – 20 = 27 – 20 = 7

= -3.13333333333 

-4/3-9/5=-3.13333333333

CHÚC BẠN HỌC TỐT

-4/3-9/5=-47/15 hoặc -3,13333333333 nha

~HT~

K cho mình nha 

@@@@@@@@@@@@@@@@@

\(\left(\frac{2}{3}-\frac{4}{7}\right):\frac{5}{9}+\left(-\frac{8}{7}+\frac{1}{3}\right):\frac{5}{9}\)

\(=\left[\left(\frac{2}{3}-\frac{4}{7}\right)+\left(-\frac{8}{7}+\frac{1}{3}\right)\right]:\frac{5}{9}\)

\(=\left(\frac{2}{3}-\frac{4}{7}-\frac{8}{7}+\frac{1}{3}\right)\cdot\frac{9}{5}\)

\(=\left(1-\frac{12}{7}\right)\cdot\frac{9}{5}\)

\(=-\frac{5}{7}\cdot\frac{9}{5}\)

\(-\frac{9}{7}\)

\(\left(\frac{2}{3}-\frac{4}{7}\right):\frac{5}{9}+\left(-\frac{8}{7}+\frac{1}{3}\right):\frac{5}{9}\)

\(=\left(\frac{14}{21}-\frac{12}{21}\right):\frac{5}{9}+\left(-\frac{24}{21}+\frac{7}{21}\right):\frac{5}{9}\)

\(=\frac{2}{21}:\frac{5}{9}+\frac{-17}{21}:\frac{5}{9}\)

\(=\left(\frac{2}{21}+\frac{-17}{21}\right):\frac{5}{9}\)

\(=\frac{-15}{21}:\frac{5}{9}\)

\(=\frac{-15}{21}.\frac{9}{5}\)

\(=\frac{-9}{7}\)

\(=\frac{99}{35}\)

= 16 - 9 ( 34 - 5^5-3 )

= 16 - 9 ( 34 - 5² )

= 16 - 9 ( 34 - 25 ) 

= 16 - 9 . 9

= 16 - 81

= + ( 81 - 16 )

= + 55

= 65 ( mình nhầm )

4²  - 9 ( 34 - 5⁵ : 5³)

\(\Rightarrow\)4² - 9 ( 34 - 5²)

\(\Rightarrow\)4² - 9 . 9

\(\Rightarrow\)4² - 81

\(\Rightarrow\)- 65

Chúc bạn học tốt ^^!

=7/11+5/6+4/11-1/6

=(7/11+4/11)+(5/6-1/6)

=1+2/3

=5/3

\(A,\dfrac{7}{11}+\dfrac{5}{6}-\dfrac{-4}{11}-\dfrac{1}{6}\)

\(= (\dfrac{7}{11}+\dfrac{-4}{11})-(\dfrac{5}{6}-\dfrac{1}{6})\)

\(=\dfrac{3}{11}-\dfrac{2}{3}\)

\(= \dfrac{9}{33}-\dfrac{22}{33}\)

\(= \dfrac{-13}{33}\)

\(B,\dfrac{5}{9}.\dfrac{7}{3}+\dfrac{5}{9}.\dfrac{9}{13}-\dfrac{5}{9}:\dfrac{13}{5}\)

\(=(\dfrac{5}{9}.\dfrac{5}{9}:\dfrac{5}{9}).\dfrac{7}{3}+\dfrac{9}{13}-\dfrac{13}{5}\)

\(=(\dfrac{5}{9}.\dfrac{7}{3})+(\dfrac{9}{13}-\dfrac{13}{5})\)

\(=(\dfrac{5}{9}.\dfrac{21}{9})+(\dfrac{45}{65}-\dfrac{169}{65})\)

\(=\dfrac{35}{27}+\dfrac{-124}{65}\)

\(=\dfrac{2275}{1755}+\dfrac{-3348}{1755}\)

\(=\dfrac{-1073}{1755}\)

4kg x 9 – 28kg = 36kg – 28kg = 8kg

3 x 8 : 4 = 24 : 4 = 6

5 × 8 + 8 = 40 + 8 = 48

28 - 2 × 4 = 28 – 8 = 20

6561 a⁵ - 95 547 843

kết quả là -1/3