Question

{4×[(5x+7)×8+9]÷10}÷(11×11+1)=1​

Answer 1

Răspuns:   x = 6

Explicație pas cu pas:

{ 4 × [ ( 5 x + 7 ) × 8 + 9 ] : 10 } : (11 × 11 + 1 ) = 1

​{ 4 × [ ( 5 x + 7 ) × 8 + 9 ] : 10 } : ( 121 + 1 ) = 1

{ 4 × [ ( 5 x + 7 ) × 8 + 9 ] : 10 } : 122 = 1

4 × [ ( 5 x + 7 ) × 8 + 9 ] : 10 = 1 × 122  

( 5 x + 7 ) × 8 + 9 = 122 × 10 : 4 → aplic metoda mersului invers

( 5 x + 7 ) × 8 + 9 = 1 220 : 4

( 5 x + 7 ) × 8 + 9 = 305

( 5 x + 7 ) × 8 = 305 - 9

5 x + 7 = 296 : 8

5 x + 7 = 37

5 x = 37 - 7

5 x = 30

x = 30 : 5

x = 6