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9•8+7•[120+5•(4•X•3)]:60=100
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Răspuns :

Răspuns:

X = 2

Explicație pas cu pas:

9•8 + 7•[120 + 5•(4•X•3)] : 60 = 100

72 + 7•[120 + 5•(12•X)] : 60 = 100

7•(120 + 60•X) : 60 = 100 - 72

(840 + 420•X) : 60 = 28

840 : 60  + 420•X : 60 = 28

14 + 7•X = 28

7•X = 28 - 14

7•X = 14

X = 14:7

X = 2