3$\frac{3}{4}$ -($\frac{8}{12}$ -0,25)
=$\frac{11}{4}$ -($\frac{8}{12}$ -$\frac{1}{4}$ )
=$\frac{11}{4}$ -$\frac{8}{12}$ +$\frac{1}{4}$
=$\frac{33}{12}$ -$\frac{8}{12}$ +$\frac{3}{12}$
=$\frac{28}{12}$ =$\frac{7}{3}$
Cho mk xin cau trả lời hay nhất +1camr ơn+ 5sao nha