a) 31 . { 330 : [178 – 4 . ( 35 – 21 : 3 )]} = 31 . { 330 : [178 – 4 . ( 35 – 7)]}

= 31 . { 330 : [178 – 4 . 28]} = 31 . { 330 : [178 – 112]}

= 31 . { 330 : 66 } = 31 . 5 = 155

a) 31 . { 330 : [178 – 4 . ( 35 – 21 : 3 )]} = 31 . { 330 : [178 – 4 . ( 35 – 7)]}

= 31 . { 330 : [178 – 4 . 28]} = 31 . { 330 : [178 – 112]}

= 31 . { 330 : 66 } = 31 . 5 = 155

b) ( 5 19  .  5 14 ) :  5 32  =  5 33 :  5 32 = 5

\(3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot\left(7^8-7^6+7^0\right)\right]\right\}\)

\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot5647153\right]\right\}\)

\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-45177224\right]\right\}\)

\(=3^3\cdot5^3-20\cdot\left\{300--45176678\right\}\)

\(=3^3\cdot5^3-20\cdot45176978\)

\(=3375-903539560\)

\(=-903536185\)

\(626500:\left\{50^2:\left[178-4\cdot\left(35-21:3\right)\right]\right\}\)

\(=626500:\left\{50^2:\left[178-4\cdot\left(35-7\right)\right]\right\}\)

\(=626500:\left\{50^2:\left[178-4\cdot28\right]\right\}\)

\(=626500:\left\{50^2:\left[178-112\right]\right\}\)

\(=626500:\left\{50^2:66\right\}\)

\(=626500:\frac{1250}{33}\)

\(=\frac{82698}{5}\)

CHUC BAN HOC TOT >.<

a: =-3/24-40/24

=-43/24

b: \(=\dfrac{6}{54}\cdot\dfrac{49}{35}=\dfrac{1}{9}\cdot\dfrac{7}{5}=\dfrac{7}{45}\)

c: \(=\dfrac{6}{5}+\dfrac{4}{3}=\dfrac{18+20}{15}=\dfrac{38}{15}\)

d: \(=\dfrac{31}{17}-\dfrac{14}{17}-\dfrac{5}{13}-\dfrac{8}{13}=1-1=0\)

a.\(\frac{5}{4}+\frac{3}{7}-\frac{1}{2}=\frac{35+12-14}{28}\)\(=\frac{33}{28}\)

=(441.14.125):42875.6=(6174.125):42875.6=771750:42875.6=18.6=108