Răspuns :
a).x*y=42
x=21
y=2
21*2=42
b).x(y+3)=21
x=3
y=4
3*(4+3)=21
3*7=21
c).x(x+2)=24
x=4
4*(4+2)=24
4*6=24
d).(x-3)(y-5)=0
x=3
y=5
x=21
y=2
21*2=42
b).x(y+3)=21
x=3
y=4
3*(4+3)=21
3*7=21
c).x(x+2)=24
x=4
4*(4+2)=24
4*6=24
d).(x-3)(y-5)=0
x=3
y=5
a)
Perechi soluții (1,42),(2,21),(3,14),(6,7)
b)
x=1, y+3=21=> y=18
x=3, y+3=7=> y=4
x=7, y+3=3=>y=0
Perechi soluții (1,42),(2,21),(3,14),(6,7)
b)
x=1, y+3=21=> y=18
x=3, y+3=7=> y=4
x=7, y+3=3=>y=0