The animal word dung thi tick nha

vao google dich cho nhanh

dung thi tick nha

x la nghiem cua f (x) \(\Leftrightarrow\) x^2 + x = 0 \(\Leftrightarrow\) x . ( x+1)=0 ban cho moi cai bang 0 nha : x=0 ; x=-1 vay nghiem cua da thuc tren la 0 va -1

dung thi tich cho minh nha

Ta co : 2.| 3x - 6 | \(\ge\) 0 \(\Rightarrow\)2.|3x-6| -4 \(\ge\)-4 dau "= " xay ra \(\Leftrightarrow\) 2.|3x-6| =0 \(\Leftrightarrow\) 3x-6=0 \(\Leftrightarrow\) x=2 vay Min ( A) = -4 \(\Leftrightarrow\) x=2

da thuc nay ko co nghiem thi phai

x la nghiem cua f (x) \(\Leftrightarrow\)x^2 + x +1 = 0 \(\Leftrightarrow\)x. ( x+1+1) = 0 \(\Leftrightarrow\)x. ( x +2) =0 bay h cho moi cai bang 0 la duoc : x =0 ; x=-2

\(\dfrac{1}{1.3}\) + \(\dfrac{1}{3.5}\)+ ...+ \(\dfrac{1}{2009.2011}\) = 1-\(\dfrac{1}{3}\) + \(\dfrac{1}{3}\) - \(\dfrac{1}{5}\) + ... + \(\dfrac{1}{2009}\) - \(\dfrac{1}{2011}\) = 1- \(\dfrac{1}{2011}\) den day ban tu tinh nha