câu 9
a)\(\dfrac{x+2}{14}\)=\(\dfrac{-1}{2}\);
b)\(\dfrac{x-1}{15}\)=\(\dfrac{4}{20}\);
c)\(\dfrac{x-7}{12}\)=\(\dfrac{-12}{16}\).
câu 10
a)\(\dfrac{x}{7}\)=\(\dfrac{x+1}{14}\);
b)\(\dfrac{2x+5}{3}\)=\(\dfrac{-4}{12}\).
ai cố giúp mình 2 bai đi