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266/7+979/3-b=102 va rog mult

Răspuns :

266/7+979/3-b=102
3-b=266*102
3-b=12.652
3-b=12.652:7
3-b=1.807
3-b=1807-979
3-b=928
3-b=928/3
3-b=309
b=309+3
b=312

s te ajute
266 / 7 + 979 / 3 - b = 102
Aducem fractiile la acelasi numitor si anume 7 · 3 = 21
Amplificam prima fractie cu 3 si a doua cu 7.

266 3 / 21 + 979 7 / 21 - 21b / 21 = 102 21 / 21
798 / 21 + 6853 / 21 - 21b / 21 = 2142 / 21
(798 + 6853 - 21b) : 21 = 2142 : 21 | 21
798 + 6853 - 21b = 2142
7651 - 21b = 2142
21b = 7651 - 2142
21b = 5509
b = 5509 : 21
b = 262,(3)