Bai 1 : Lop 6A co 25% so hoc sinh dat loai gioi , \(\frac{2}{3}\)so hoc sinh dat loai kha va 3 hoc sinh dat loai trung binh ( ko co hoc sinh yeu kem ) . Hoi lop 6A :
a) Co bao nhieu hoc sinh ?
b) Co bao nhieu hoc sinh dat loai gioi , bao nhieu hoc sinh dat loai kha ?
Bai 2 : Thuc hien phep tinh :
a) \(\frac{-5}{2}:\left\{\frac{3}{4}-\frac{1}{2}\right\}\)b, \(\left\{\frac{-5}{24}+0,75+\frac{7}{12}\right\}:\left\{-2\frac{1}{4}\right\}^2\)c, \(11\frac{3}{13}-\left\{2\frac{4}{7}+5\frac{3}{13}\right\}\)
