Question

205+[9×60-(240:4:x+8)×10]×10:17=405

Answer 1

Răspuns

Explicație pas cu pas:

205 + [ 9 × 60 - ( 240 : 4 : X + 8 ) × 10 ] × 10 : 17 = 405

[ 540 - ( 60 : X + 8 ) × 10 ] × 10 : 17 = 405 - 205

[ 540 - ( 60 : X + 8 ) × 10 ] × 10 : 17 = 200

540 - ( 60 : X + 8 ) × 10 = 200 × 17 : 10 → aplic metoda mersului invers  

540 - ( 60 : X + 8 ) × 10 = 340

( 60 : X + 8 ) × 10 = 540 - 340

( 60 : X + 8 ) × 10 = 200

60 : X + 8 = 200 : 10

60 : X + 8 = 20

60 : X = 20 - 8

60 : X = 12

X = 60 : 12

X = 5 → numarul

Answer 2

205 + [ 9 × 60 - ( 240 : 4 : x + 8 ) × 10 ] × 10 : 17 = 405

205 + [ 540 - ( 60 : x + 8 ) × 10 ] × 10 : 17 = 405

[ 540 - ( 60 : x + 8 ) × 10 ] × 10 : 17 = 405 - 205

[ 540 - ( 60 : x + 8 ) × 10 ] × 10 : 17 = 200

[ 540 - ( 60 : x + 8 ) × 10 ] × 10 = 200 × 17

[ 540 - ( 60 : x + 8 ) × 10 ] × 10 = 3400

[ 540 - ( 60 : x + 8 ) × 10 ] = 3400 : 10

[ 540 - ( 60 : x + 8 ) × 10 ] = 340

[ ( 60 : x + 8 ) × 10 ] = 540 - 340

[ ( 60 : x + 8 ) × 10 ] = 200

60 : x + 8 = 200 : 10

60 : x + 8 = 20

60 : x = 20 - 8

60 : x = 12

x = 60 : 12

x = 5