I. Trắc Nghiệm:
1.B
2.A
3.B
4.C
II. tự luận
Bài 1:
a. $\frac{5}{9}$ -($\frac{4}{5}$ +$\frac{2}{3}$ ):1$\frac{1}{5}$
=$\frac{5}{9}$-$\frac{22}{15}$ :$\frac{6}{5}$
=$\frac{5}{9}$-$\frac{11}{9}$
=$\frac{-6}{9}$
b. (3$\frac{3}{8}$:$\frac{5}{6}$ - 6$\frac{5}{8}$ :$\frac{5}{6}$) . $\frac{5}{6}$ =[(3$\frac{3}{8}$-6$\frac{5}{8}$):$\frac{5}{6}$]. $\frac{5}{6}$ =$\frac{-13}{4}$ : $\frac{5}{6}$.$\frac{5}{6}$ =$\frac{-13}{4}$
bài 2:
a. $\frac{1}{5}$ - x=40%
$\frac{1}{5}$ - x=$\frac{2}{5}$
x= $\frac{1}{5}$ - $\frac{2}{5}$
x=$\frac{-1}{5}$
Vậy x= $\frac{-1}{5}$
b. ⇒\(\left[ \begin{array}{1}3-2x=2\\3-2x=-2\end{array} \right.\) ⇒\(\left[ \begin{array}{1}2x=3-2\\2x=3-(-2)\end{array} \right.\) ⇒\(\left[ \begin{array}{l}2x=1\\2x=5\end{array} \right.\) ⇒\(\left[ \begin{array}{l}x=1:2=\frac{1}{2} \\x=5:2=\frac{5}{2} \end{array} \right.\) vậy x=$\frac{1}{2}$ hoặc x=$\frac{5}{2}$
