Răspuns :
a+b = 733
b = 2a+7
a + 2a +7 = 733 3a = 726 a = 242 b = 491
2. a+b+c = 797
b = 3a, c = b + 13 = 3a +13
a + 3a + 3a +13 = 797 7a = 784 a = 112 b = 336 c= 349
b = 2a+7
a + 2a +7 = 733 3a = 726 a = 242 b = 491
2. a+b+c = 797
b = 3a, c = b + 13 = 3a +13
a + 3a + 3a +13 = 797 7a = 784 a = 112 b = 336 c= 349
1)
a +b = 733
b = 2×a+7
a + 2a+7 = 733
3a = 733-7
3a = 726
a = 726:3
a = 242
b = 733 -242
b = 491
verificare:
242+491 = 733
2)
a+b+c = 797
b = 3×a
b = c-13 ==> c = b+13 = 3×a+13
inlocuim in prima ecuatie in functie de a
a + 3a + 3a + 13 = 797
7a = 797 -13
7a = 784
a = 784 :7
a = 112
b = 3×112
b = 336
c = 3×112+13 = 336+13 = 349
a = 112
b = 336
c = 349
Verificare:
112+336+349 = 797
a +b = 733
b = 2×a+7
a + 2a+7 = 733
3a = 733-7
3a = 726
a = 726:3
a = 242
b = 733 -242
b = 491
verificare:
242+491 = 733
2)
a+b+c = 797
b = 3×a
b = c-13 ==> c = b+13 = 3×a+13
inlocuim in prima ecuatie in functie de a
a + 3a + 3a + 13 = 797
7a = 797 -13
7a = 784
a = 784 :7
a = 112
b = 3×112
b = 336
c = 3×112+13 = 336+13 = 349
a = 112
b = 336
c = 349
Verificare:
112+336+349 = 797