Question

[nguyen quang nhat y]

a ) 1 3/4 x - 5 = 3 1/3

b) 2/3x + 1/4 = 7/12

c) 1/3 + 2/5 ( x + 1 ) = 1

Answer 1

[I don't need you]

a) \(1\frac{3}{4}x-5=3\frac{1}{3}\)

\(\frac{7}{4}.x-5=\frac{10}{3}\)

\(\frac{7}{4}.x=\frac{10}{3}+5\)

\(\frac{7}{4}.x=\frac{25}{3}\)

\(x=\frac{25}{3}:\frac{7}{4}\)

\(x=\frac{100}{21}\)

b) \(\frac{2}{3}x+\frac{1}{4}=\frac{7}{12}\)

\(\frac{2}{3}x=\frac{7}{12}-\frac{1}{4}\)

\(\frac{2}{3}x=\frac{1}{3}\)

\(x=\frac{1}{3}:\frac{2}{3}\)

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

c) \(\frac{1}{3}+\frac{2}{5}.\left(x+1\right)=1\)

\(\frac{2}{5}.\left(x+1\right)=1-\frac{1}{3}=\frac{2}{3}\)

\(x+1=\frac{2}{3}:\frac{2}{5}\)

\(x+1=\frac{5}{3}\)

\(x=\frac{5}{3}-1\)

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

Chúc bn học tốt !!!!!!