\(450:\left(x-19\right)=15\)
\(=>x-19=450:15=30\)
\(=>x=30+19=49\)
\(\left(x-1\right)\left(y-2\right)=2=1.2=-1.-2\)
\(x-1=1=>x=2\)
\(y-2=1=>y=3\)
\(x-1=2=>x=3\)
\(y-2=2=>y=4\)
\(x-1=-1=>x=0\)
\(y-2=-1=>y=1\)
\(x-1=-2=>x=-1\)
\(y-2=-2=>y=0\)
Câu C làm tương tự câu b