Question

afla termenul necunscut a+23-34=31 a-65+47=69 89-a+55=79 43+a-72=16

Answer 1

a+23-34=31  a+23=31+34    a+23=65    a=65-23    a=42
a-65+47=69    a-65=69-47    a-65=22    a=65+22    a=87
89-a+55=79    89-a=79-55    89-a=24    a=89-24    a=65
43+a-72=16    43+a=16+72    43+a=88    a=88-43    a=45

Answer 2

a+23=31+34=>a+23=65=>a=65-23=>a=42 ;a-65=69-47=>a-65=22=>a=22+65=>a=87 ;89-a=79-55=>89-a=24=>a=89+24=>a=113  ;43+a=16+72=>43+a=88=>a=88-43=>a=45