1: \(\Leftrightarrow\left(x-3;y+2\right)\in\left\{\left(1;5\right);\left(5;1\right);\left(-1;-5\right);\left(-5;-1\right)\right\}\)
=>\(\left(x,y\right)\in\left\{\left(4;3\right);\left(8;-1\right);\left(2;-7\right);\left(-2;-3\right)\right\}\)
2: ƯCLN(-12;18;28)=2
=>ƯC(-12;18;28)={1;-1;2;-2}
3: BCNN(15;-12;-30)=60
=>BC(15;-12;-30)={0;60;-60;...}
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