a)

12 × 4 = 4 × 12

106 × 3 = 3 × 106

(17 × 5) × 2 = 17 × (5 × 2)

86 × 2 × 5 = 86 × (2 × 5)

b)

7 × 1 = 7

432 × 1 = 432

519 × 0 = 0

1 × 0 = 0

2 × 0 = 0

3 456 × 1 = 3 456

17x - 4x = 8^8 : 8^6 + ( 2016 )^0

= 17x - 4x = 65

=> ( 17 - 4 ) . x = 65

=> 13x = 65

x = 65 : 13

x = 5

17x - 4x  = 8^2 + 1

(17 - 4 )x = 64 + 1

13x         = 65

          x  = 65 : 13

          x  = 5

x = 5

mình mới lại!!

17x - 4x = 8⁸:8⁶+(2016)⁰

<=> 8² + 1 = 13x

<=> 65 = 13x

<=> x = 5

\(17x-4x=8^8:8^6+\left(2016\right)^0\)

\(\Rightarrow13x=8^2+1\)

\(\Rightarrow13x=65\)

\(\Rightarrow x=5\)

Vậy \(x=5\)

Ta có: 17x-4x=8⁸:8⁶+(2016)⁰

\(\Rightarrow\)8²+1=13x

\(\Rightarrow\)65=13x

\(\Rightarrow\)x=5

a: 86-x>86-4

=>-x>-4

hay x<4

b: x+28<28+3

=>x+28<31

hay x<3

x=0,1,2,3

x=0,1,2

a,86-x>86-4

86-x > 82

-x > 82 -86

-x> -4

x< 4

b,x+28<28+3

x+ 28 < 31

=> x < 31 - 28 

x < 3

bằng 5 đúng rùi mà ???

\(4x+26=86.\Leftrightarrow4x=60.\Leftrightarrow x=15.\)

\(4x+26=86\\ 4x=86-26\\ 4x=60\\\Rightarrow x=15\)

Bài làm

17x - 4x = 8⁸ : 8⁶ + ( 2016 )⁰ 

17x - 4x = 8² + 1

17x - 4x = 64 + 1

17x - 4x = 65

x( 17 - 4 ) = 65

x . 13 = 65

x        = 65 : 13

x        = 5

Vậy x = 5

# Học tốt #

17x-4x=8⁸:8⁶+(2016)⁰

13x=8²+1

13x=64+1

13x=65

    x=65:13

    x=5

vậy x=5

 13x=8²+1

13x=64+1

13x=65

   x=65:13

   x=5

(x - 78) . 86 = 0

x - 78 = 0 : 86 = 0

x = 0 + 78 = 78

Tick nha.