-1

=(2/11+4/11-6/11)+(-3/8-5/8)=-1

(2/11 + 4/11 - 6/11 ) - (3/8 + 5/8) 
= 0 -1 
= -1 

a) 20

b) 2

c) 0

d) -1

Like  nha bạn !!

a; (-5) + 11 + 17 + (-3)

= - 5 + 11 + 17 - 3

= - (5 + 3) + (11 + 17)

= - 8 + 28

= 20

b; \(\dfrac{17}{8}\) - \(\dfrac{5}{8}\) + \(\dfrac{-7}{8}\) + \(\dfrac{11}{8}\)

=  \(\dfrac{12}{8}\) - \(\dfrac{7}{8}\) + \(\dfrac{11}{8}\)

= \(\dfrac{5}{8}\) + \(\dfrac{11}{8}\)

= \(\dfrac{16}{8}\)

= 2

mik tick cho

3/11 x 2 = 6/11

6/11 : 3/11 = 2

6/11 : 2 = 3/11

2/3 x 11 = 22/3

4/2 x 7 = 14

8/7 : 2/7 = 4

8/7 : 4 = 2/7

2/7 x 4 = 8/7

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

ai cứu với ạ

ko 

có chết đâu mà phải cứu

\(\dfrac{2}{1}+\dfrac{12}{56}=\dfrac{112+12}{56}=\dfrac{122}{56}=\dfrac{61}{28}\)

\(\left(\dfrac{8+7}{15}\right):\dfrac{2}{11}\)

\(1:\)\(\dfrac{2}{11}\)

\(\dfrac{11}{2}\)

\(\dfrac{2}{1}+\dfrac{12}{56}=\dfrac{112}{56}+\dfrac{12}{56}=\dfrac{122}{56}=\dfrac{61}{28}\)

\(=\left(\dfrac{8}{15}+\dfrac{7}{15}\right)\times\dfrac{11}{2}=\dfrac{15}{15}\times\dfrac{11}{2}=1\times\dfrac{11}{2}=\dfrac{11}{2}\)

2 + 3/8 x 4/7 =61/28
8/15 : 2/11 + 7/15 : 2/11 =11/2