a: \(=\dfrac{18+6}{27+6}=\dfrac{24}{33}=\dfrac{8}{11}\)

b: \(=\dfrac{21\cdot7\cdot11}{11\cdot3\cdot4}=\dfrac{49}{4}\)

Trả lời

= 49/4 

49/4

a) 37/25

b) 3/2

c) 5/3

d) 3/2

tham khảo :

a)

b)

c)

d)

a) \(\dfrac{4}{5}+\dfrac{17}{25}=\dfrac{20}{25}+\dfrac{17}{25}=\dfrac{37}{25}\)
b) \(\dfrac{7}{3}-\dfrac{5}{6}=\dfrac{14}{6}-\dfrac{5}{6}=\dfrac{9}{6}=\dfrac{3}{2}\)
c)\(1+\dfrac{2}{3}=\dfrac{3}{3}+\dfrac{2}{3}=\dfrac{5}{3}\)

Tham khảo:

c) Tính:

A x 5 = 19 + 6

=> A x 5 = 25

=> A = 25 : 5

=> A = 5

\(A\times5=19+6\\ A\times5=25\\ A=25:5\\ A=5\)

A= A x 5 = 25
A = 25 : 5 
A = 5

K thấy j ạ

OKI

a) (- 48) + (- 67) = - (48 + 67) = - 115

b) (- 79) + (- 45) = - (79 + 45) = - 124

a) (-48)+(-67)=-|48+67|=-115

b) (-79)+(-45)=-|79+45|=-124

a.-105 b.-124

a)

b)

a)

b)

a) 11,42             b) 34              c) 21,3

a)399,7 : 35 = 11,42

b) 85 : 2,5 = 34

c) 266,25 :12,5 = 21,3

a. 399,7 : 35 = 11,42

b.  85 : 2,5 = 34

c.  266,25 :12,5 = 21,3

Ta có: \(A=2^{100}-2^{99}-2^{98}-...-2^2-2-1\)

\(\Leftrightarrow2A=2^{101}-2^{100}-2^{99}-...-2^3-2^2-2\)

\(\Leftrightarrow2A-A=2^{101}-2^{100}-2^{99}-...-2^3-2^2-2-2^{100}+2^{99}+2^{98}+...+2^2+2+1\)

\(\Leftrightarrow A=2^{101}-2\cdot2^{100}+1\)

\(\Leftrightarrow A=1\)

Thank you

146,01:18,6=7,85

74,82:43,5=1,72

a, 7,85

b, 1,72