👤
Zibi142
a fost răspuns

daca a +b+c =24 si b+c+d=35 calculati 2a+7b+7c+5d
Urgent!! 20 puncte!!!

Răspuns :

a +b+c =24 inmultim cu 2 => 2a+2b+2c=48
b+c+d=35 inmultim cu 5 => 5b+5c+5d=175
se descompune ecuatia: 
2a+7b+7c+5d in 2a+2b+5b+2c+5c+5d si grupam termenii 2a+2b+2c+5b+5c+5d=48+175=223
a+b+c=24 
24:3=8
a=8
b=8
c=8
b+c+d=35
8+8+d=35
16+d=35
d=19
2a+7b+7c+5d
2*8+7*8+7*8+5*19=223

Alte intrebari