A=[(-51)+59]-[(-51)-(-59)]

=[(-51)+59]-[(-51)+59]

=(-51)+59+51-59

=[(-51)+51)]+(59-59)

=0+0

=0

Chúc bạn học giỏi nha!!!

K cho mik vs nhé

Ko ghi đề nữa nha, bỏ ngoặc luôn

(51+59)-(51+59)= 110+110= 220

Nhanh nhất nek, TÍCH NHA

\(27\dfrac{51}{59}-\left(7\dfrac{51}{59}-\dfrac{1}{3}\right)=\dfrac{1614}{59}-\left(\dfrac{464}{59}-\dfrac{1}{3}\right)=\dfrac{1614}{59}-\dfrac{1333}{177}=\dfrac{3509}{177}\)

\(27\dfrac{51}{59}-\left(7\dfrac{51}{59}-\dfrac{1}{3}\right)=27\dfrac{51}{59}-7\dfrac{51}{59}+\dfrac{1}{3}=27+\dfrac{51}{59}-7-\dfrac{51}{59}+\dfrac{1}{3}=20+\dfrac{1}{3}=\dfrac{61}{3}\)

a ) 17 2 31 − 15 17 + 6 2 31 = 17 2 31 − 6 2 31 − 15 17 = 11 − 15 17 = 10 2 17 .

b ) 31 6 13 + 5 9 41 − 36 6 13 = 31 6 13 − 36 6 13 + 5 9 41 = − 5 + 5 9 41 = 9 41 .

a )   5 4 9 − 9 7 12 − 4 5 9 = 5 4 9 + 4 5 9 − 9 7 12 = 10 − 9 7 12 = 5 12 .

b ) 8 1 3 + 7 , 8 + 5 2 3 − 1 , 8. = 8 1 3 + 5 2 3 + 7 , 8 − 1 , 8 = 14 + 6 = 20

Mình chưa hiểu đề lắm nhưng chắc ý bạn là như này:
   \(87\frac{23}{59}+74\frac{17}{71}+12\frac{36}{59}+25\frac{5}{71}\)
= \(\left(87\frac{23}{59}+12\frac{36}{59}\right)+\left(25\frac{5}{71}+74\frac{17}{71}\right)\)
= \(\left(87+12\right)+\left(\frac{23}{59}+\frac{36}{59}\right)+\left(25+74\right)+\left(\frac{5}{71}+\frac{17}{71}\right)\)
= \(99+\frac{59}{59}+99+\frac{22}{71}\)
= \(198+1+\frac{22}{71}\)
= \(199\frac{22}{71}\)
Chúc bạn học tốt ^^!

ngu cái này tao cũng ko bt

ê đừng nói tục nha bẹn

sorry

a.(4568+3759)-(4563+3764)

= 4568+3759-4563-3764

=(4568-4563)+(3759-3764)

=5+(-5)

=0

b.(56*27+56*35):62

=56*27+56*35:62

=56*(27+35):62

=56*62:62

=56*(62:62)

=56*1

=56

a)=0

b)=56

a (4568+3759)-(4563+3764)

=(4568-4563)+(3764-3759)

= 5+5=10

b (56x27+56x35):62

=56x(27+35):62

=56x62:62

=56

a)

\(15+27+9+85+73\)

\(=\left(15+85\right)+\left(27+73\right)+39\)

\(=200+39\)

\(=329\)

b)

\(54.36+54.27+54.37\)

\(=54\left(36+27+37\right)\)

\(=54.100\)

\(=5400\)

c)

\(168-3^7:3^4+2013^0\)

\(=168-3^3+1\)

\(=168-27+1\)

\(=142\)

d)

\(3^4.15+81.26+27.59.3\)

\(=81.15+81.26+81.59\)

\(=81.\left(15+26+59\right)\)

\(=81.100\)

\(=8100\)

Tính giá trị của các biểu thức sau :

a.15 + 27 + 39 + 85 + 73

= ( 15 + 85 ) + ( 27 + 73 ) + 39

= 100 + 100 + 39

= 200 + 39

= 239

b. 54 .36 + 54 . 27 + 54 . 37

= 54 . ( 36 + 27 + 37 )

= 54 . 100

= 5400

c.168 - 3⁷ : 3⁴ + 2013⁰

= 168 - 3³ + 1

= 168 - 27 + 1

= 141 + 1

= 142

đ. 3⁴ . 15 + 81 . 26 + 27 . 59 . 3

= 3⁴ . 15 + 3⁴ . 26 + 3⁴ . 59

= 3⁴ . ( 15 + 26 + 59 )

= 81 . 100

= 8100

a.15 + 17 + 39 + 85 + 73

= ( 15 + 85 ) + ( 17 + 73 ) + 39

= 100 + 90 + 39

= 229

b. 54.36+54.27+54.37

= 54.(36+27+37)

= 54.100

=5400

c.168-3^7_:3⁴+2013⁰

⁼ 168-3^7-4+1

= 168-3³+1

= 168-27+1

= 142

d.3⁴.15+81.26+27.59.3

= 3⁴.15+3⁴.26+3³.59.3

= 3⁴.15+3⁴.26+3⁴.59

= 3⁴.(15+26+59)

= 3⁴.100

= 81.100

= 8100