Răspuns :
4. a)
ax(b+c)=2x50 =>100
b)x·(y+z)=9·11+15=99+15=114
5 b)
x·(a-b)+9x(a-b)=654
x·6+9x6=654
6x+54=654
6x=600
x=100
ax(b+c)=2x50 =>100
b)x·(y+z)=9·11+15=99+15=114
5 b)
x·(a-b)+9x(a-b)=654
x·6+9x6=654
6x+54=654
6x=600
x=100