Bài 3:

a) \(\Rightarrow\dfrac{2}{15}x=-\dfrac{11}{15}\Rightarrow x=-\dfrac{11}{2}\)

b) \(\Rightarrow\left|x+\dfrac{1}{3}\right|=5\)

\(\Rightarrow\left[{}\begin{matrix}x+\dfrac{1}{3}=5\\x+\dfrac{1}{3}=-5\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{14}{3}\\x=-\dfrac{16}{3}\end{matrix}\right.\)

Bài 4:

Áp dụng t/c dtsbn:

\(\dfrac{a}{11}=\dfrac{b}{9}=\dfrac{c}{12}=\dfrac{a-b+c}{11-9+12}=\dfrac{-28}{14}=-2\)

\(\Rightarrow\left\{{}\begin{matrix}a=\left(-2\right).11=-22\\b=\left(-2\right).9=-18\\c=\left(-2\right).12=-24\end{matrix}\right.\)

bought

have collected

visited

have bought

collected

failed

went

1 was searching

2 came

3 was trying

4 slipped 

5 fell

6 saw

7 plucked

8 dropped

9 climbed

Bài 1:

a) \(=\dfrac{4}{9}-\dfrac{1}{4}-1=-\dfrac{29}{36}\)

b) \(=-\dfrac{11}{18}:\dfrac{31}{36}=-\dfrac{11}{18}.\dfrac{36}{31}=-\dfrac{22}{31}\)

Bài 2:

a) \(\Rightarrow x=\dfrac{2}{5}+\dfrac{5}{7}=\dfrac{39}{35}\)

b) \(\Rightarrow\left|2x+\dfrac{1}{2}\right|=\dfrac{7}{6}\)

\(\Rightarrow\left[{}\begin{matrix}2x+\dfrac{1}{2}=\dfrac{7}{6}\\2x+\dfrac{1}{2}=-\dfrac{7}{6}\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=-\dfrac{5}{6}\end{matrix}\right.\)

Bài 3:

\(27^{11}=\left(3^3\right)^{11}=3^{33}>3^{32}=\left(3^4\right)^8=81^8\)

trời ơi ko đặt tính dc đừng bắt ngk đặt tính nxx

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