Question

Determina suma a+b+c,stiind ca:
a)7a+7b+7c=35;
b)200-11a-11b-11c=101.​

Answer 1

Răspuns:

a) 5; b) 9

Explicație pas cu pas:

a)

7a+7b+7c=35

7•(a+b+c) = 35 |:7

=> a+b+c = 5

b)

200-11a-11b-11c=101

11a + 11b + 11c = 200 - 101

11•(a+b+c) = 99 |:11

=> a+b+c = 9

Answer 2

$a) \: \: 7(a + b + c) = 35 \\ \implies \:\underline{ a + b + c = 5 }\\ \\ b) \: \: 200 - 11(a + b + c) = 101 \\ \implies - 11(a + b + c) = - 99 \\ \implies \:\underline{ a + b + c = 9}$