Theo bài ra, ta có: (a+1989+2003+2034):4=a-4
(a+6026)=(a-4).4
a+6026=a.4-16
6026=a.3-16
a.3=6026+16
a.3=6042
a =6042:3
a =2014
Theo bài ra ta có :
(a+1989+2003+2034):4=a-4
=> (a+6026)=(a-4).4
=>a+6026=a.4-16
6026=a.3-16
=>a.3=6026+16
=>a.3=6042
=>a=6042:3
=>a=2014
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