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2 ) Calculeaza termenul necunoscut:

1000-[(185+a)x2-727+333x3]=0


Răspuns :

1000-[(185+a)x2-727+333x3]=0
(185+a)x2-727+999 = 1 000
(185+a)x2-727 = 1 000-999
(185+a)x2-727 = 1
(185+a)×2 = 1+727
(185+a)×2 = 728
185+a = 728:2
185+a = 364
a = 364- 185
a = 179