Question

Tìm x , y biết

h) y + 30% y = -1,3

i) \(\left(\dfrac{31}{7}+1\right):\left(-4\right)=\left(\dfrac{-1}{28}\right)\)

j) x : \(\dfrac{4}{28}=\dfrac{13}{-19}+\dfrac{8}{25}\)

k) \(\dfrac{3}{4}-x=\dfrac{5}{9}+\dfrac{6}{11}\)

help me !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

\(y+30\%y=-1,3\\ 130\%y=-1,3\\ \Rightarrow y=\dfrac{-1,3}{130\%}=-1\)

Answer 2

\(x:\dfrac{4}{28}=\dfrac{13}{-19}+\dfrac{8}{25}\\ 7x=-\dfrac{173}{475}\\ x=-\dfrac{\dfrac{173}{475}}{7}=-\dfrac{173}{3325}\)

Answer 3

\(\dfrac{3}{4}-x=\dfrac{5}{9}+\dfrac{6}{11}\\ -x=\dfrac{139}{396}\Rightarrow x=-\dfrac{139}{396}\)