Question

Tìm X biết X+25%.X=1/2

Answer 1

x + 25%x = \(\frac{1}{2}\)

x.1+\(\frac{1}{4}\)x = \(\frac{1}{2}\)

x.(\(1+\frac{1}{4}\)) = \(\frac{1}{2}\)

x . \(\frac{5}{4}\)= \(\frac{1}{2}\)

x       = \(\frac{1}{2}\div\frac{5}{4}\) 

x       = \(\frac{2}{5}\)

Answer 2

Ta có : \(X+25\%.X=\frac{1}{2}\Leftrightarrow X+\frac{1}{4}.X=\frac{1}{2}\Leftrightarrow X.\left(1+\frac{1}{4}\right)=\frac{1}{2}\)\(\Leftrightarrow X.\frac{5}{4}=\frac{1}{2}\Leftrightarrow X=\frac{1}{2}:\frac{5}{4}\Leftrightarrow X=\frac{2}{5}\)

Answer 3

bn qên chưa rút gọn rồi đó ngô mih hoàng à!