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542+x-117=638
(43+x)+(537-214)=975


Răspuns :

1. 542+x-117=638
x=638 +117-542
x=213

2. (43+x)+(537-214)=975
43+x+(537-214)=975
43+x+323=975
x=975 - 323 - 43
x=609




1) 542+x-117=638
542+x=638+117
542+x=755
x=755-542
x=213

2) (43+x)+(537-214)=975
(43+x)+323=975
43+x=652
x=609