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HA HA HA HA HA HA HA HA ĐỒ NGU NHÉ THẬT RA MÌNH BIẾT CÂU TRẢ LỜI NÀY QUÁ DỄ DÀNG VỚI MÌNH VẬY MÀ BẠN CŨNG HỎI HẢ NGU QUÁ ĐI HOI
\(a,f\left(1\right)=3\cdot1^2+1+1=5\\ f\left(-\dfrac{1}{3}\right)=3\cdot\left(-\dfrac{1}{3}\right)^2-\dfrac{1}{3}+1=\dfrac{1}{3}-\dfrac{1}{3}+1=1\\ f\left(\dfrac{2}{3}\right)=3\cdot\left(\dfrac{2}{3}\right)^2-\dfrac{2}{3}+1=\dfrac{4}{3}-\dfrac{2}{3}+1=\dfrac{5}{3}\\ f\left(-2\right)=3\cdot\left(-2\right)^2-2+1=11\\ f\left(-\dfrac{4}{3}\right)=3\cdot\left(-\dfrac{4}{3}\right)^2-\dfrac{4}{3}+1=\dfrac{16}{3}-\dfrac{4}{3}+1=5\)
\(b,f\left(\dfrac{2}{3}\right)=\left|2\cdot\dfrac{2}{3}-9\right|-3=\dfrac{23}{3}-3=\dfrac{14}{3}\\ f\left(-\dfrac{5}{4}\right)=\left|2\cdot\left(-\dfrac{5}{4}\right)-9\right|-3=\dfrac{23}{2}-3=\dfrac{17}{2}\\ f\left(-5\right)=\left|2\left(-5\right)-9\right|-3=19-3=16\\ f\left(4\right)=\left|2\cdot4-9\right|-3=1-3=-2\\ f\left(-\dfrac{3}{8}\right)=\left|2\cdot\left(-\dfrac{3}{8}\right)-9\right|-3=\dfrac{39}{4}-3=\dfrac{27}{4}\)
\(c,x=0\Rightarrow y=2\cdot0^2-7=-7\\ x=-3\Rightarrow y=2\cdot\left(-3\right)^2-7=11\\ x=-\dfrac{1}{2}\Rightarrow y=2\cdot\left(-\dfrac{1}{2}\right)^2-7=\dfrac{-13}{2}\\ x=\dfrac{2}{3}\Rightarrow y=2\cdot\left(\dfrac{2}{3}\right)^2-7=-\dfrac{55}{9}\)
\(.1.\)
Ta có : \(f\left(x\right)=\frac{2}{3}-\frac{1}{2}\left|x-1\right|\)
Thay
+ \(f\left(0\right)=\frac{2}{3}-\frac{1}{2}\left|0-1\right|\)
\(\Rightarrow f\left(0\right)=\frac{2}{3}-\frac{1}{2}\)
\(\Rightarrow f\left(0\right)=\frac{4}{6}-\frac{3}{6}\)
\(\Rightarrow f\left(0\right)=\frac{1}{6}\)
+ \(f\left(-1\right)=\frac{2}{3}-\frac{1}{2}\left|-1-1\right|\)
\(\Rightarrow f\left(-1\right)=\frac{2}{3}-\frac{1}{2}.2\)
\(\Rightarrow f\left(-1\right)=\frac{2}{3}-1\)
\(\Rightarrow f\left(-1\right)=\frac{2}{3}-\frac{3}{3}\)
\(\Rightarrow f\left(-1\right)=-\frac{1}{3}\)
+ \(f\left(1\right)=\frac{2}{3}-\frac{1}{2}\left|1-1\right|\)
\(\Rightarrow f\left(1\right)=\frac{2}{3}-\frac{1}{2}.0\)
\(\Rightarrow f\left(1\right)=\frac{2}{3}-0\)
\(\Rightarrow f\left(1\right)=\frac{2}{3}\)
+ \(f\left(\frac{3}{4}\right)=\frac{2}{3}-\frac{1}{2}\left|\frac{3}{4}-1\right|\)
\(\Rightarrow f\left(\frac{3}{4}\right)=\frac{2}{3}-\frac{1}{2}.\frac{1}{4}\)
\(\Rightarrow f\left(\frac{3}{4}\right)=\frac{2}{3}-\frac{1}{8}\)
\(\Rightarrow f\left(\frac{3}{4}\right)=\frac{16}{24}-\frac{3}{24}=\frac{13}{24}\)
a) thay vào mà tính:
f(0) = -02 +4 = 4
...........................
f(0)=-02 +4=4
f(2)=-22 +4=0
f(1/3)=-(1/3)2 +4=35/9
f(-1/2)=-(-1/2)2 +4=15/4
g(-5)=-3.(-5)=15
g(1/3)=-3.1/3=-1
TICK GIÙM MIK NHA
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