Question

giúp mình bài b,c

Answer 1

\(a,x=-\dfrac{7}{12}-\dfrac{5}{12}=-1\)

\(b,\Rightarrow x=14-13=1\)

\(c,x+\dfrac{4}{5}=\dfrac{79}{30}\Leftrightarrow x=\dfrac{79}{30}-\dfrac{4}{5}=\dfrac{79-24}{30}=\dfrac{55}{30}=\dfrac{11}{6}\)

Answer 2

b \(\dfrac{x}{20}=\dfrac{27}{20}\)

\(x=\dfrac{27}{20}\)x \(20\)

\(x=27\)

c \(x+\dfrac{4}{5}=\dfrac{79}{30}\)

\(x=\dfrac{79}{30}-\dfrac{4}{5}\)

\(x=\dfrac{11}{6}\)

Answer 3

a: =>x=-7/12+5/12=-2/12=-1/6

b: =>x/20=14/20-13/20=1/20

hay x=1

c: =>x+4/5=18/60-140/60=-122/60

=>x=-122/60-4/5=-122/60-48/60=-170/60=-17/6