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![](https://rs.olm.vn/images/avt/0.png?1311)
d: \(\dfrac{1}{27}:\left(-\dfrac{1}{3}\right)^2+75\%\cdot\left(-\dfrac{2^2}{3}\right)\)
\(=\dfrac{1}{27}:\dfrac{1}{9}+\dfrac{3}{4}\cdot\dfrac{-4}{3}\)
\(=\dfrac{1}{3}-1\)
\(=-\dfrac{2}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{3}-4\left(\dfrac{1}{2}+\dfrac{3}{4}\right)\\ =\dfrac{2}{3}-4.\dfrac{2+3}{4}\\ =\dfrac{2}{3}-4.\dfrac{5}{4}\\ =\dfrac{2}{3}-5\\ =\dfrac{2-15}{3}\\ =\dfrac{-13}{3}\)
`a)2/3-4(1/2+3/4)`
`=2/3-4*1/2-4*3/4`
`=2/3-2-3`
`=2/3-5`
`=2/3-15/3`
`=-13/3`
![](https://rs.olm.vn/images/avt/0.png?1311)
A = \(\dfrac{1}{2}\) - 0,75 + \(\dfrac{5}{4}\) - \(\dfrac{6}{12}\)
A = 0,5 - 0,75 + 1,25 - 0,5
A = (0,5 - 0,5) + (1,25 - 0,75)
A = 0,5
B = (-\(\dfrac{1}{7}\))0 - 22.(\(\dfrac{2}{3}\))2
B = 1 - 22. \(\dfrac{4}{9}\)
B = 1 - \(\dfrac{88}{9}\)
B = - \(\dfrac{79}{9}\)
\(a.0,\left(13\right)+1,\left(86\right)-\frac{5}{7} \)
\(=86-\frac{5}{7}\)
\(=\frac{602}{7}-\frac{5}{7}\)
\(=\frac{597}{7}\)
\(b.\left[0,\left(4\right)\right]^2-\frac{1}{81}+\frac{22}{27}\)
\(=0-\frac{1}{81}+\frac{66}{81}\)(ở đây quy đồng mẫu số )
\(=-\frac{1}{81}-\frac{66}{81}\)
\(=-\frac{67}{81}\)
Học tốt!!
#Minkk!