\(\dfrac{4}{-55}+-\dfrac{2}{-121}\)

\(=\dfrac{4}{-55}+\dfrac{2}{121}\)

\(=\dfrac{-44}{605}+\dfrac{10}{605}\)

\(=\dfrac{-44+10}{605}\)

\(=\dfrac{-34}{605}\)

1+6-2+9-55+77 . 88 : 44 : 2 . 11 : 121

= 1+6-2+9-55+7

= -34

\(1+6-2+9-55+77.88:44:2.11:121=-41+7=-34\)

[363x15]+[121x55]

=5445+665

=12100.

`@` `\text {Ans}`

`\downarrow`

\(\dfrac{5}{9}\times121\times\dfrac{3}{55}\)

`=`\(\dfrac{605}{9}\times\dfrac{3}{55}=\dfrac{11}{3}\)

5/9 x 121 x 3/55

= 605/9 x 3/55

= 11/3.

 \(\dfrac{5}{9}\)  \(\times\) 121\(\times\) \(\dfrac{3}{55}\)  = \(\dfrac{5\times11\times11\times3}{3\times3\times5\times11}\) = \(\dfrac{11}{3}\) 

n: =345:(-345)=-1

n, (-15) x (-23) : (-345)

=   345  : (-345)

= -1

o, 36.55 - 185.11 + 121.5

 = 36.11.5 - 5.11.37 + 11.11.5

= 11.5.(36- 37 + 11)

= 11.5.10

= 550

\(\dfrac{-22}{121}=\dfrac{-22:11}{121:11}=\dfrac{-2}{11}\)

\(\dfrac{4}{-22}=\dfrac{4:2}{-22:2}=\dfrac{2}{-11}=\dfrac{-2}{11}\)

\(-\dfrac{10}{55}=-\dfrac{10:5}{55:5}=-\dfrac{2}{11}=\dfrac{-2}{11}\)

Vậy ...

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

Khi rút gọn tất cả bằng -2 phần 11 nên các phân số trên bằng nhau

Chọn B

Chọn B

D

B