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, \(11\frac{3}{13}-\left\{2\frac{4}{7}+5\frac{3}{13}\right\}\)

thực hiện phép tính

a.\(\frac{5}{7}.1^9_{13}-\frac{5}{7}.\frac{9}{13}\)

b.\(\frac{11}{24}-\frac{5}{41}+\frac{13}{24}+0,5-\frac{36}{41}\)

c.\(\frac{-4}{13}.\frac{5}{17}+\frac{-12}{13}.\frac{4}{17}+\frac{4}{13}\)

d.\(\left(\frac{4}{3}-\frac{3}{2}\right)^2-2.\left|\frac{-1}{9}\right|+\left(\frac{-5}{18}\right)\)

e.\(\left(\frac{-3}{4}+\frac{2}{3}\right):\frac{5}{11}+\left(\frac{-1}{4}+\frac{1}{3}\right):\frac{5}{11}\)

BT1: Thuc hien phep tinh

\(\left(-1,25\right).14,7.\left(-8\right)\)

\(\frac{3}{4}-1\frac{1}{6}\)

\(\frac{-3}{5}.51\frac{11}{13}+\frac{3}{5}.21\frac{11}{13}\)

\(\left[\frac{-3}{4}\right].\left[-\frac{2}{3}\right]\)

\(\frac{-3}{5}+5\frac{1}{13}-\frac{2}{3}+1\frac{3}{5}-\frac{11}{13}\)

\(\frac{3}{4}.\sqrt{16-10}.\sqrt{0,81}\)

\(\left(\frac{3}{4}\right)^3:\left(-\frac{3}{8}\right)^3\)

\(\frac{6^4.15^3}{8.9^3.10^3}\)

BT2: Tim x,y biet:

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

\(\left[x\right]-\frac{4}{5}=\frac{2}{5}\)

\(\frac{x}{-5}=\frac{24}{15}\)

\(\frac{x}{4}=\frac{y}{5}vax-y=21\)