Question

[Pham Trong Bach]

Thực hiện phép tính (tính hợp lí nếu có thể):

$\begin{array}{l}a)\frac{1}{12} +\frac{2}{3} + \frac{-3}{4} \begin{array}{cc}& \end{array}\begin{array}{cccc}& & & \end{array}b)\frac{1}{2} -\frac{2}{5} +\frac{-7}{10}\\ \\ c)\frac{1}{2} +\frac{-3}{7}+\frac{5}{2}+\frac{-4}{7}\begin{array}{cccc}& & & \end{array}d)\frac{9}{8}-\frac{4}{7}+\frac{-1}{8}+\frac{11}{7}\\ \\ e)\frac{6}{11}+\left(\frac{-2}{3}+\frac{5}{11}\right)\begin{array}{cccc}& & & \end{array}f)\frac{-1}{2}+\frac{11}{4}-\left(\frac{11}{4}-\frac{1}{2}\right)\\ \\ g)\left(10\frac{2}{9}+2\frac{3}{5}\right)-5\frac{2}{9}\begin{array}{cccc}& & & \end{array}h)\left(\frac{44}{7}-3\frac{5}{9}\right)-\left(5\frac{2}{7}+\frac{4}{9}\right)\end{array}$

Answer 1

[Cao Minh Tâm]

a ) 1 12 + 2 3 + − 3 4 = 1 12 + 8 12 + − 9 12 = 0

b ) 1 2 − 2 5 + − 7 10 = 5 10 − 4 10 + − 7 10 = − 6 10 = − 3 5 c ) 1 2 + − 3 7 + 5 2 + − 4 7 = 1 2 + 5 2 + − 3 7 + − 4 7 = 2 d ) 9 8 − 4 7 + − 1 8 + 11 7 = 9 8 + − 1 8 + − 4 7 + 11 7 = 2 e ) 6 11 + − 2 3 + 5 11 = 6 11 + 5 11 + − 2 3 = 1 3 f ) − 1 2 + 11 4 − 11 4 − 1 2 = − 1 2 + 11 4 − 11 4 + 1 2 = 0