Question

[Pham Trong Bach]

Thực hiện các phép tính sau:

$a)2\frac{5}{7}.4\frac{1}{5};\begin{array}{cccc}& & & \end{array}\begin{array}{cc}& \end{array}b)6\frac{5}{8}:2\frac{7}{4};$

$c)6\frac{7}{8}.\left(-2\frac{14}{9}\right)\begin{array}{cccc}& & & \end{array}d)1\frac{7}{8}:\left(-4\frac{1}{4}\right)$

$e)\left(-4\frac{2}{9}\right).\left(-5\frac{1}{2}\right);\begin{array}{ccc}& & \end{array}f)\left(-2\frac{8}{9}\right):\left(-4\frac{1}{3}\right);$

$g)3\frac{6}{5}.2;\begin{array}{cccc}& & & \end{array}h)5\frac{4}{7}:2$

Answer 1

[Cao Minh Tâm]

a ) 2 5 7 .4 1 5 = 19 7 . 21 5 = 57 5 . b ) 6 5 8 : 2 7 4 = 53 8 : 15 4 = 53 30

c ) 6 7 8 . − 2 14 9 = 55 8 . − 32 9 = − 220 9

d ) 1 7 8 : − 4 1 4 = 15 8 : − 17 4 = − 15 34

e ) − 4 2 9 . − 5 1 2 = − 38 9 . − 11 2 = 209 9 f ) − 2 8 9 : − 4 1 3 = − 26 9 : − 13 3 = 26 39 g ) 3 6 5 .2 = 3 + 6 5 .2 = 3.2 + 6 5 .2 = 6 + 12 5 = 42 5 h ) 5 4 7 : 2 = 5 + 4 7 : 2 = 5 2 + 2 7 = 39 14