\(P=\left(x-1\right)\left(x+2\right)\left(x+3\right)\left(x+6\right)\)

\(P=\left[\left(x-1\right)\left(x+6\right)\right]\left[\left(x+2\right)\left(x+3\right)\right]\)

\(P=\left(x^2+5x-6\right)\left(x^2+5x+6\right)\)

\(P=\left(x^2+5x\right)^2\ge-36\)

\(\Rightarrow GTNN\) của \(P=-36\)

Dấu = sảy ra khi:\(x^2+5x=0\)

.....................\(\Rightarrow x=0\) hoặc \(x=-5\)

9 nha Nguyễn Thị Thùy Trang

\(3,2.x+\left(-1,2\right).x+2,7=-4,9\)

\(x.\left(3,2+\left(-1,2\right)\right)+2,7=-4,9\)

\(x.2+2,7=-4,9\)

\(x.2=-4,9-2,7=-7,6\)

\(x=-7,6:2=-3,8\)

Mình cũng chúc bạn giáng sinh an lành!!!

MERRY CHRISMAS, TOO!

24x23+56x23=23x(34+56=23=100=2300

409x34+124+34=34x(409+124)=34x533=12792