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3.Determinati valoarea lui "a" din: 546+127-96:3+73×2-(62:a+24 : 2) -5×11=689
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Răspuns :

546+127-96:3+73×2-(62:a+24 : 2)-5×11 =689

673 - 32 + 146 - (62:a+12)-55 = 689

787 - (62:a+12) - 55 = 689

62 : a + 12 = 787 - 55 - 689

62 : a + 12 = 43

62 : a = 43 - 12

62 : a = 31

a = 62 /31