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Determinati termenul necunoscut
[(a-400:4+2)+3]×2=86


Răspuns :

(a-400:4+2)+3=86:2
                       =43
a-102=43-3
a-102=40
a=40+102
a=142
[(a-400:4+2)+3]×2=86
[(a-400:4+2)+3]=86:2
(a-400:4+2)+3=43
(a-400:4+2)=43-3
a-400:4+2=40
a-100+2=40
a-98=40
a=98+40
a=138