a, x+4/7=7/4-1/4
x + 4/7 = 6/4
x = 6/4 - 4/7
x = 26/28
b, 9/2+(x-3/4)=25/4
x - 3/4 = 25/4 - 9/2
x - 3/4 = 7/4
x = 7/4 + 3/4
x = 10/4
a, x+4/7=7/4-1/4
x+4/7= 3/2
x = 3/2-4/7= 13/14
b,9/2+(x-3/4)=25/4
x-3/4 = 25/4 - 9/2 = 7/4
x= 7/4 + 3/4 = 5/2
\(a,x+\frac{4}{7}=\frac{7}{4}-\frac{1}{4}\)
\(x+\frac{4}{7}=\frac{3}{2}\)
\(x=\frac{3}{2}-\frac{4}{7}\)
\(x=\frac{13}{14}\)
\(b,\frac{9}{2}+\left(x-\frac{3}{4}\right)=\frac{25}{4}\)
\(x-\frac{3}{4}=\frac{25}{4}-\frac{9}{2}\)
\(x-\frac{3}{4}=\frac{7}{4}\)
\(x=\frac{7}{4}+\frac{3}{4}\)
\(x=\frac{5}{2}\)
đc đấy Yến ak,photoshop cx khá ổn áp đấy
