Question

Daca a+2b=39 ; b+3c=60 Calculati: a) a+3b+3c b)2a+5b+3c c) a+4b+6c d) 3a+8b+6c​ Calculați rapid va rog!!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

a+2b=39

b+3c=60

a) a+3b+3c

a + 2b + b + 3c = 39 + 60

a + 3b + 3c = 99

__________

b)2a+5b+3c

2(a + 2b) + b + 3c = 2*39 + 60

2a + 4b + b + 3c = 78 + 60

2a + 5b + 3c = 138

__________

c) a+4b+6c

a + 2b + 2(b + 3c) = 39 + 2*60

a + 2b + 2b + 6c = 39 + 120

a + 4b + 6c = 159

_____________

3a+8b+6c​

3(a + 2b) + 2(b + 3c) = 3*39 + 2*60

3a + 6b + 2b + 6c = 117 + 120

3a + 8b + 6c = 237