Question

                25%x+1/2(x-4/5)=2,6

Answer 1

\(25\%+\frac{1}{2}\left(x-\frac{4}{5}\right)=2,6\)

\(\frac{1}{4}+\frac{1}{2}\left(x-\frac{4}{5}\right)=2,6\)

\(\frac{1}{4}+\frac{1}{2}x-\frac{1}{2}\cdot\frac{4}{5}=2,6\)

\(\frac{1}{2}x-\frac{2}{5}=2,6-\frac{1}{4}\)

\(\frac{1}{2}x=2,35+\frac{2}{5}\)

\(\frac{1}{2}x=2,75\)

\(x=2,75:\frac{1}{2}=5,5\)

Answer 2

Thiếu chữ x kìa bạn ơi 25%x mà

Answer 3

\(25\%+\frac{1}{2}\left(x-\frac{4}{5}\right)=2,6\)

\(\frac{1}{4}+\frac{1}{2}\left(x-\frac{4}{5}\right)=2,6\)

\(\frac{1}{4}+\frac{1}{2}x-\frac{1}{2}.\frac{4}{5}=2,6\)

\(\frac{1}{2}x-\frac{2}{5}=2,6-\frac{1}{4}\)

\(\frac{1}{2}x=2,35+\frac{2}{5}\)

\(\frac{1}{2}x=2,75\)

\(x=2,75:\frac{1}{2}=5,5\)

Answer 4

Thiếu chữ x nha 2 bạn nhìn trên đề kìa

Answer 5

xin lỗi để mình sửa lại

\(25\%x+\frac{1}{2}\left(x-\frac{4}{5}\right)=2,6\)

\(\frac{1}{4}x+\frac{1}{2}x-\frac{2}{5}=\frac{13}{5}\)

\(\left(\frac{1}{4}+\frac{1}{2}\right)x=\frac{13}{5}+\frac{2}{5}=\frac{15}{5}=3\)

\(\frac{3}{4}x=3\)

\(x=3:\frac{3}{4}=\frac{12}{3}=4\)