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) \(2^3.17-2^3.14\)

\(8.17-8.14\)

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

\(=8.3=24\)

a)14/13+(-1/13-19/20)=1/20 

b)-24/17-(-7/17-1/16)=-479/272

\(a,=\dfrac{14}{13}-\dfrac{1}{13}-\dfrac{19}{20}\\ =1-\dfrac{19}{20}=\dfrac{20}{20}-\dfrac{19}{20}\\ =\dfrac{1}{20}\\ b,=\dfrac{-24}{17}+\dfrac{7}{17}+\dfrac{1}{16}\\ =-1+\dfrac{1}{16}\\ =\dfrac{-16}{16}+\dfrac{1}{16}=\dfrac{-15}{16}\)

^{_{a)14/13+(-1/13-19/20)=1/20}}

^{_{b)-24/17-(-7/17-1/16)=-479/272}}

33.(17 – 5) – 17.(33 -5)

= 33. 17 – 33.5 – 17.33 + 17.5

= (33.17 – 33. 17) + ( 17.5 – 33.5)

= 0 + 5.(17- 33)

= 5.(- 16) = -80

a.$17\cdot (29-(-111\left)\right]+29\cdot (-17)$ 

$=17\cdot (29+111)-29\cdot 17$

$=17\cdot (29+111-29)$

$=17\cdot (29-29+111)$

$=17\cdot 111$

$=2997$

b.$19\cdot 43+(-20)\cdot 43-(-40)$

$=19\cdot 43-20\cdot 43+40$

$=43(19-20)+40$

$=43\cdot (-1)+40$

$=-43+40$

$=-3$

 [ chúc bạn học tốt ]

\(=\left(-14+14\right)+5+17\)
\(=0+5+17\)
\(=22\)

( -14) +5+17+14

= [( -14)+14] +5+17

=          0       +5+17

= 5+17 

=22

54 – 6.(17 + 9)

= 54 –( 6. 17 + 6.9)

= 54 – 102 – 54

= (54 – 54) – 102 = -102

31.(17-3)-31.(17+3)

=\(-31[-\left(17-3\right)-\left(17+3\right)|\)

= -31(-17+3-17-3)

=-31.(-34)

=1054

lomelomygybgjybvyvivfgygyvgvg

31.(17-3)-31.(17+3)

<=>31(17-3-17-3)

<=>31.(-6)=-186

a) \(212+109+188\)

\(=\left(212+188\right)+109\)

\(=400+109\)

\(=509\)

b) \(27+45+18+81\)

\(=72+99\)

\(=171\)

c) \(\left(14+72+36+60\right):12\)

\(=182:12\)

\(=\frac{91}{6}\)

bạn ơi mình lớp 6 cơ tính  bằng cach hợp lí phần c) không đc đổi ra phân số bạn ạ lớp 6 mà

a) 212 + 109 + 188

= ( 212 + 188 ) + 109

= 400 + 109

= 509

b) 27 + 45 + 18 + 81

= ( 27 + 18 ) + 45 + 81

= 45 + 45 + 81

= 90 + 81

= 171

c) ( 14 + 72 + 36 + 60 ) : 12

= ( 14 + 36 ) : 12 + ( 72 + 60 ) : 12

= 50 : 12 + 132 : 12

= ( 132 + 50 ) : 12

= 182 : 12

= 15,1666

a.18.17-3.6.7
 =18.17-18.7
 =18.(17-7)
 =18.10=180
b.54-6.(17+9)
 =54-6.26
 =54-156=-102
c.33.(17-5)-17.(33-5)
 =33.17-33.5-17.33+17.5
 =33.5+17.5
 =(33+17).5
 =50.5=250