\(1\dfrac{14}{15}-\dfrac{5}{17}-\dfrac{12}{17}-\dfrac{14}{15}\\ =\left(1\dfrac{14}{15}-\dfrac{14}{15}\right)-\left(\dfrac{5}{17}+\dfrac{12}{17}\right)\\ =\left[1+\left(\dfrac{14}{15}-\dfrac{14}{15}\right)\right]-1=1-1=0\)

a) \(17+188+183=205+183=388\)

b) \(80-\left[130-\left(12-4\right)^2\right]\)

\(=80-\left(130-64\right)\)

\(80-66=14\)

c) \(2^3.17-2^3.14\)

\(8.17-8.14\)

\(=8.\left(17-14\right)\)

\(=8.3=24\)

`31/17+(-5/13)+(-8/3)-14/17`

`=(31/17-14/17)-(5/13-8/3)`

`=17/17-(15/39-104/39)`

`=1-(-89/39)`

`=1+89/39`

`=39/39+89/39`

`=128/39`

A. -14 - 7 - 12 - 24 

= - 21 - 12 - 24

= - 33 - 24

= - 57

B. -10 - 14 - 16 + 43

= - 24 - 16 + 43

= - 40 + 43

= - 83

C. 32 + |-23| - 57 - (-23)

= 32 + 23 - 57 +23

= 55 - 57 + 23

= - 2 + 23

= 21

D. |-8| + |-4| - (-12) + 5

= 8 + 4 + 12 + 5

= 12 + 12 + 5

= 24 + 5

= 29

E. |-13| - |-17| + (-20) - (-18) 

= 13 - 17 - 20 + 18

= - 4 - 17 - 20 + 18

= - 21 - 20 + 18

= - 41 + 18

= 23

A. -14-7-12-24=-21-36=-57

B. -10-14-16+43=-24+27=3

C.32+\(^{|-23|}\)-57-(-23)=32+23-57+23=55-80=-25

D.\(|-8|+|-4|\)-(-12)+5=8+4+12+5=12+17=29

E.\(|-13|-|-17|\)+(-20)-(-18)=13-17-20+18=-4-2=-6

a) 25 –[ 50 – (  2 3  . 17 –  2 3  . 14 )]

= 25 – ( 50 –  2 3 . 3 ) = 25 – ( 50 – 24 )

= 25 – 26 = -1

a)(-12)+(-9)+112+|-30|

=(-21)+112+30

= 91+ 30 

=121

b) - 2015 + (-268)+(-201)+168+301

=(-2283)+(-33)+301

=(-2316)+301

= - 2015

c)160 :{|-17|+[3x2x5-(14+2x11:2x8)]}

= 160 :{17+[3x2x5-(14+22:16)]}

=160:{17+[ 3x2x5-15,375]

=160:{17+30-15,375}

=160:31,625

=5,05

a) 5.2² - 18 : 3

= 5.4 - 18 : 9

= 20 - 2

= 18

b) 17 . 85 + 15 . 17 - 120

= 17 . (85 + 15) - 120

= 17 . 100 - 120

= 1700 - 120

= 1580

c) 2³ . 17 - 2³ . 14

= 8 . 17 - 8 . 14

= 8 . (17 - 14)

= 8 . 3

= 24

a) 5 . 2² – 18 : 3² 

= 5.4 – 18 : 9

= 20 – 2

= 18

b) 17 . 85 + 15 . 17 – 120

= 17. (85 + 15) – 120

= 17.100 – 120

= 170 – 120

= 50

c) 2³ . 17 – 2³ . 14

= 2³.(17 - 14)

= 2³.3

= 8.3

= 24

a) \(=\left(\left(-\frac{1}{4}-\frac{5}{3}\right)+\frac{7}{33}\right)-\left(-\frac{15}{12}+\frac{6}{11}-\frac{48}{49}\right)\)

\(=\left(-\frac{23}{12}+\frac{7}{33}\right)+\frac{15}{12}-\frac{6}{11}+\frac{48}{49}\)

\(=\left(-\frac{23}{12}+\frac{15}{12}\right)+\left(\frac{9}{33}-\frac{6}{11}\right)+\frac{48}{49}\)

\(=-\frac{2}{3}-\frac{3}{11}+\frac{48}{49}\)

\(=\frac{65}{1617}\)

b) \(=\frac{11}{125}+\left(-\frac{17}{18}+\frac{4}{9}\right)+\left(-\frac{5}{7}+\frac{17}{14}\right)\)

\(=\frac{11}{125}-\frac{1}{2}+\frac{1}{2}\)

\(=\frac{11}{125}\)

tính từng cái là đc