b. (-274).71+(-274).29

  = (-274).(71+29)

  = (-274). 100

  = -27400

 (-274).71+(-274).29

=(-274).(71+29)

=(-274).100

=(-27400)

\(2.3^x=10.3^{12}+8.27^4\)

\(2.3^x=10.3^{12}+8.\left(3^3\right)^4\)

\(2.3^x=18.3^{12}\)

\(3^x=9.3^{12}=3^{14}\)

\(x=14\)

2.3ˣ = 10.3¹² + 8.27⁴

2.3ˣ = 10.3¹² + 8.(3³)⁴

2.3ˣ = 10.3¹² + 8.3¹²

2.3ˣ = 3¹².(10 + 8)

2.3ˣ = 3¹².18

3ˣ = 3¹².18 : 2

3ˣ = 3¹² . 9

3ˣ = 3¹² . 3²

3ˣ = 3¹⁴

x = 14

15¹² = 3¹².5¹²

27⁴.25⁶ = (3³)⁴.(5²)⁶ 

27⁴ = 3¹².5¹² 

15¹² = 27⁴.25⁶

27⁴.5⁶ = (3³)⁴.(5²)⁶ = 3¹².5¹² = 15¹²

Vậy 15¹² = 27⁴.5⁶

a.

\(a^2\),\(4^3,8^2\)

B

\(a^3\),\(9^2,254^1\)

C

\(a^2\)và \(a^3\),\(54^2,36^3,48^4\)

327/929 lớn hơn

so sánh 274/871 và 327/929

ta có: +] 1-274/871=597/871

          +]1-327/929=602/929

\(\Rightarrow\)597/871>602/929

vậy 274/871>327/929

a)  2 5 7 .4 1 5 = 19 7 . 21 5 = 57 5

b)  6 5 8 : 2 7 4 = 53 8 : 15 4 = 53 30

21.{350 : [274 - 2³(35 - 28 : 4)]}
= 21.{350 : [274 - 8(35 - 7)]}
= 21.{350 : [274 - 8.28]}
= 21.{350 : [274 - 224]}
= 21.{350 : 50}
= 21.7
= 147

21.{350:[274-2³.(35-28:4)

=21.{350:[274-8.28]

=21.{350:[274-224]

=21.{350:50}

=21.7=147