em nên gõ công thức trực quan để đề bài rõ ràng nhé

\(\frac{3}{4}+\frac{-1}{3}+\frac{-5}{18}\)

\(=\frac{5}{12}+\frac{-5}{18}\)

\(=\frac{5}{36}\)

4 câu nè bn

\(\frac{3}{4}+(-\frac{1}{3})+(-\frac{5}{18})\)\(=\frac{3}{4}-\frac{1}{3}-\frac{5}{18}=\frac{27}{36}-\frac{12}{36}-\frac{10}{36}=\frac{27-12-10}{36}=\frac{5}{36}\)

học tốt

mấy câu sau tương tự

\(=\dfrac{10}{17}-\dfrac{5}{3}+7-\dfrac{8}{13}+\dfrac{11}{25}\)

\(=\dfrac{30}{51}-\dfrac{85}{51}+\dfrac{175}{25}+\dfrac{11}{25}-\dfrac{8}{13}\)

\(=\dfrac{-55}{51}+\dfrac{186}{25}-\dfrac{8}{13}\)

\(=\dfrac{-55\cdot325+186\cdot663-8\cdot1275}{16575}=\dfrac{95243}{16575}\)

`C=(12/35-6/7+18/14):6/(-7)-(-2)/5-1`

`C=(12/35-6/7+9/7):(-6)/7+2/5-1`

`C=(12/35+3/7):(-6)/7+2/5-1`

`C=(12/35+15/35):(-6)/7+2/5-1`

`C=27/35*(-7)/6+2/5-1`

`C=-9/10+2/5-1`

`C=-9/10+4/10-1`

`C=-1/2-1=-3/2`

Ta có: \(C=\left(\dfrac{12}{35}-\dfrac{6}{7}+\dfrac{18}{14}\right):\dfrac{6}{-7}-\dfrac{-2}{5}-1\)

\(=\left(\dfrac{24}{70}-\dfrac{60}{70}+\dfrac{90}{70}\right):\dfrac{-6}{7}-\dfrac{-2}{5}-\dfrac{5}{5}\)
\(=\dfrac{27}{35}\cdot\dfrac{-7}{6}-\dfrac{3}{5}\)

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

1: Rút gọn

a) \(-\dfrac{33}{51}=\dfrac{-33:3}{51:3}=\dfrac{-11}{17}\)

b) \(\dfrac{156}{-168}=\dfrac{-156}{168}=\dfrac{-156:12}{168:12}=\dfrac{-13}{14}\)

c) \(\dfrac{-75}{-100}=\dfrac{75}{100}=\dfrac{75:25}{100:25}=\dfrac{3}{4}\)

2: Quy đồng mẫu:

a) \(-\dfrac{3}{8}\) và \(\dfrac{5}{4}\)

MSC: 8

\(-\dfrac{3}{8}=\dfrac{-3}{8}\)

\(\dfrac{5}{4}=\dfrac{5\cdot2}{4\cdot2}=\dfrac{10}{8}\)

b) \(\dfrac{-7}{6}\) ; \(\dfrac{5}{12}\) và \(-\dfrac{5}{6}\)

MSC: 12

\(-\dfrac{7}{6}=\dfrac{-7\cdot2}{6\cdot2}=\dfrac{-14}{12}\)

\(\dfrac{5}{12}=\dfrac{5}{12}\)

\(\dfrac{-5}{6}=\dfrac{-5\cdot2}{6\cdot2}=\dfrac{-10}{12}\)

Đề bài yêu cầu j vậy?

mũ 2 tui ko bt

chịu bạn ơi

27,3 cộng 5,7 = bao nhiêu

fffff

`1/3+ -1/4+1/5+ -1/6+1/7+1/6+1/(-5)+1/4+ -1/3`

`=(1/3-1/3)+(1/4-1/4)+(1/5-1/5)+(1/6-1/6)+1/7`

`=0+0+0+0+1/7`

`=1/7`

gấp ạ