16x-5x²-3
16x -5x mũ 2 -3
\(=-5x^2+15x+x-3\)
=(x-3)(-5x+1)
PTDTTNT
`16x-5x^2-3`
\(-5x^2+16x-3\\ =-5x^2+15x+x-3\\ =-5x\left(x-3\right)+\left(x-3\right)\\ =\left(-5x+1\right)\left(x-3\right)\)
16x-5x^2-3
\(16x-5x^2-3\\ =15x+x-5x^2-3\\ =\left(15x-5x^2\right)-\left(3-x\right)\\ =5x\left(3-x\right)-\left(3-x\right)\\ =\left(3-x\right)\left(5x-1\right)\)
16x-5x^2-3
5x/2x-3 - x-18/3-2x - 16x/2x-3
\(\dfrac{5x}{2x-3}-\dfrac{x-18}{3-2x}-\dfrac{16x}{2x-3}=\dfrac{5x+x-18-16x}{2x-3}=\dfrac{-10x-18}{2x-3}\)
16x-5x2-3
=-5(x2-3.2x+0.6)
=-5(x2-2x1.6+2.56-1.96)
=-5[(x-1.6)2-1.96]
=-5(x-1.6)2+9.8
đề bài có bắt c/m gì không?
16x-5x2-3
\(16x-5x^2-3\\ =15x+x-5x^2-3\\ =\left(15x-5x^2\right)-\left(3-x\right)\\ =5x\left(3-x\right)-\left(3-x\right)\\ =\left(5x-1\right)\left(3-x\right)\)
16x-5x2-3=?
16x - 5x2 - 3
= - (5x2 - 16x + 3)
= - (5x2 - 15x - x + 3)
= - [(5x2 - 15x) - (x - 3)]
= - [5x(x - 3) - (x - 3)]
= - (x - 3)(5x - 1)
= (3 - x)(5x - 1)
Chúc bạn học tốt!
16x-5x2-3