Question

9099+[860+(500-5×X)×9]÷5÷1000=9100 Metoda mersului invers
Dau coroană

Answer 1

Răspuns:

[860+(500-5x)•9]:5:1000=1

[860+(500-5x)•9]:5=1000

860+(500-5x)•9=5000

(500-5x)•9=4140

500-5x=460

5x=500-460

5x=40

x=8

Answer 2

Răspuns:  X = 8

Explicație pas cu pas:

9099 + [860 + ( 500 - 5 × X ) × 9 ] : 5 : 1000 = 9100

[860 + ( 500 - 5 × X ) × 9 ] : 5 : 1000 = 9 100 - 9099

[860 + ( 500 - 5 × X ) × 9 ] : 5 : 1000 = 1

860 + ( 500 - 5 × X ) × 9 = 1 × 1000 × 5 → aplic metoda mersului invers

860 + ( 500 - 5 × X ) × 9 = 5000

( 500 - 5 × X ) × 9 = 5000 - 860

( 500 - 5 × X ) × 9 = 4140

500 - 5 × X = 4 140 : 9

500 - 5 × X = 460

5 × X = 500 - 460

5 × X = 40

X = 40 : 5

X = 8