Question

27 puncte si coroana,cine rezolva exercitiile 3;4;5;6

Answer 1

3)
x+2>2
x>2-2
x>0
x∈(0;∞]
4)
x+y=2
-x+y=0
y-x=0
y=0+x
y=x
x+x=2
2x=2
x=2:2
x=1
y-1=0
y=0+1
y=1
6)
3^2cm^2=9cm^2
√6^2cm^2=6cm^2
1^2cm^2=1cm^2
9cm^2+6cm^2+1cm^2=16cm^2
diagonala^2=16cm^2
diagonala=√16cm^2
diagonala=4cm