Question

tìm số nguyên a;b

           (a+1)(b+2)=3

a.b lớn nhất

Answer 1

a=-4 ; b=-3  đó bn !!!

Answer 2

\(\Leftrightarrow\left(a+1\right)b+2a+2=3\)

\(\Rightarrow\left(a+1\right)b+2a-3+2=0\)

\(\Rightarrow\left(a+1\right)b+2a-1=0\)

=>a+1=0

=>a=-1

=>b+2=0

=>b=-2

Answer 3

\(\Leftrightarrow\left(a+1\right)b+2a+2=3\)

\(\Rightarrow\left(a+1\right)b+2a-3+2=0\)

\(\Rightarrow\left(a+1\right)b+2a-1=0\)

=>a+1=0

=>a=-1

=>b+2=0

=>b=-2

Thay a=-1;b=-2,ta có:
a.b=-1.-2=2