a, 5\(\dfrac{4}{27}\) + \(\dfrac{6}{23}\) + 0,25 - \(\dfrac{4}{27}\) + \(\dfrac{17}{23}\)

= 5 +  (\(\dfrac{4}{27}\) - \(\dfrac{4}{27}\)) + (\(\dfrac{6}{23}\) + \(\dfrac{17}{23}\)) + 0,25

= 5 + 1 + 0,25

= 6,25

b, 16.(\(\dfrac{1}{2}\))³ - \(\dfrac{3}{5}\): 0,75

= 16.\(\dfrac{1}{8}\) - 0,8

= 2 - 0,8

= 1,2

tính cách thuận tiện nha mn

32764 + 236 + 2467-2467

=33000+0

=3300

   32764 + 2467 + 236 - 2467

= ( 32764 + 236) + ( 2467 - 2467)

= 33000 + 0

= 33000 

Lời giải:

$\frac{1}{4}-3x+\frac{3}{2}=-0,75$

$3x=\frac{1}{4}+\frac{3}{2}-(-0,75)=2,5$

$\Rightarrow x=2,5:3=\frac{5}{6}$

(-5/24+0,75+7/12).(-2 1/4)

=(-5/24+3/4+7/12).(-9/4)

=9/8.(-9/4)

=-81/32

132,34

132,34

=132.34

\(\dfrac{1}{2}-\left(40\%-0,75\right)\)

\(=\dfrac{1}{2}-\left(\dfrac{40}{100}-\dfrac{3}{4}\right)\)

\(=\dfrac{1}{2}-\left(\dfrac{2}{5}-\dfrac{3}{4}\right)\)

\(=\dfrac{1}{2}-\left(\dfrac{8}{20}-\dfrac{15}{20}\right)\)

\(=\dfrac{1}{2}-\left(-\dfrac{7}{20}\right)\)

\(=\dfrac{1}{2}+\dfrac{7}{20}\)

\(=\dfrac{10}{20}+\dfrac{7}{20}\)

\(=\dfrac{17}{20}\)