Question

daca xy+xz+xt=100si x=40 aflati x+y+z


daca ab la a2 + ac la a2 +adla a2 =90 si a la a2+b2+c2=9,aflati a .

Answer 1

1)
x(y+z+t)=100
y+z+t=100-40(x)
y+z+t=60

2)


Nu stiu