cum se rezolva urmatorul ex
1. A={ x|x∈z-3≤x<4}={-3; -2; -1; 0; 1; 2; 3}
B={x|x∈z|x|<3}={-2; -1; 0; 1; 2; 3;}
C={x|x∈z,12:x}={-12; -6; -4; -3; -2; -1;1;2;3;4;6;12}
AUBUC=
A-B=
A-C=
A(un u intors) B (un u intors) C=
2. 2x-14=-4
8(x-5)-3(x+1)=2x+43
-2x+1≥-3x+7-5x