Question

y + 30%y = -1,3

y -25% y = 1/2

ai nhanh tui tích cho

 

               

Answer 1

\(\text{y + 30%y = -1,3}\)

\(\text{y . ( 100%+30% ) = -1,3}\)

\(\text{y . 130% = -1,3}\)

\(\text{y= -1,3:130%}\)

\(\text{y = -1,3 : 130 . 100}\)

\(\text{y = 1}\)

\(\text{ Vậy y = 1}\)

Answer 2

y =  - 1

y =  \(\frac{2}{3}\)

Answer 3

a) \(y+30\%y=\frac{-1}{3}\)

\(y+\frac{3}{10}y=\frac{-1}{3}\)

\(y.\left(1+\frac{3}{10}\right)=\frac{-1}{3}\)

\(y.\frac{13}{10}=\frac{-1}{3}\)

\(y=\frac{-1}{3}:\frac{13}{10}\)

\(y=\frac{-10}{39}\)

b)   \(y-25\%y=\frac{1}{2}\)

\(y-\frac{1}{4}y=\frac{1}{2}\)

\(y.\left(1-\frac{1}{4}\right)=\frac{1}{2}\)

\(y.\frac{3}{4}=\frac{1}{2}\)

\(y=\frac{1}{2}:\frac{3}{4}\)

\(y=\frac{2}{3}\)