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\(\overrightarrow{m}=2\overrightarrow{a}+3\overrightarrow{b}-\overrightarrow{c}=2\left(3;2\right)+3\left(-4;7\right)-\left(5;0\right)=\left(2.3-3.4-5;2.2+3.7+0\right)=\left(-11;25\right)\)
\(\overrightarrow{a}=x.\overrightarrow{b}+y.\overrightarrow{c}\) \(\Rightarrow\left\{{}\begin{matrix}3=-4x+5y\\2=7x+0.y\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{-11}{28}\\y=\dfrac{2}{7}\end{matrix}\right.\)
Vậy \(\overrightarrow{a}=\dfrac{-11}{28}\overrightarrow{b}+\dfrac{2}{7}\overrightarrow{c}\)
Tương tự câu trên: \(\overrightarrow{c}=x.\overrightarrow{a}+y.\overrightarrow{b}\) \(\Rightarrow\left\{{}\begin{matrix}5=3x-4y\\0=2x+7y\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{35}{29}\\y=\dfrac{-10}{29}\end{matrix}\right.\) \(\Rightarrow\overrightarrow{c}=\dfrac{35}{29}\overrightarrow{a}-\dfrac{10}{29}\overrightarrow{b}\)
Quên còn biểu biễn b chưa làm, thôi bạn tự làm nốt, nó y hệt thôi, cứ việc bấm máy giải hệ 3s là xong
vecto i=(1;0)
vecto j=(0;1)
a: vecto a=(1;-3)
b: vecto b=(1/2;1)
c: vecto c=(-1;3/2)
d: vecto d=(0;-4)
e: vecto e=(3;0)
\(\overrightarrow{c}=2\left(2;1\right)+3\left(3;-2\right)=\left(4+9;2-6\right)=\left(13;-4\right)\)
\(\left[{}\begin{matrix}2x_U-3x_A+x_B=0\\2y_U-3y_A+y_B=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}2x_U=6\\2y_U=2\end{matrix}\right.\Rightarrow\overrightarrow{u}=\left(3;1\right)\)
\(b.\left[{}\begin{matrix}3x_U+2x_A+3x_B=3x_C\\3y_U+2y_A+3y_B=3y_C\end{matrix}\right.\left[{}\begin{matrix}3x_U=1\\3y_U=-31\end{matrix}\right.\Rightarrow\overrightarrow{u}=\left(\dfrac{1}{3};-\dfrac{31}{3}\right)\)
\(\overrightarrow{u}+2\overrightarrow{v}-3\overrightarrow{w}+\overrightarrow{x}=\overrightarrow{0}\)
\(\Rightarrow\overrightarrow{x}=3\overrightarrow{w}-\overrightarrow{u}-2\overrightarrow{v}=3\left(-5;7\right)-\left(2;-5\right)-2\left(3;4\right)=\left(-23;18\right)\)
\(\overrightarrow{u}=2\overrightarrow{a}-\overrightarrow{b}=2\left(2;-4\right)-\left(-5;3\right)=\left(4;-8\right)-\left(-5;3\right)=\left(9;-11\right)\)
a.
\(\overrightarrow{u}=2\left(2;1\right)-\left(3;4\right)=\left(1;-2\right)\)
\(\overrightarrow{v}=3\left(3;4\right)-2\left(7;2\right)=\left(-5;8\right)\)
\(\overrightarrow{w}=5\left(7;2\right)+\left(2;1\right)=\left(37;11\right)\)
b.
\(\overrightarrow{x}=2\left(2;1\right)+\left(3;4\right)-\left(7;2\right)=\left(0;4\right)\)
\(\overrightarrow{z}=2\left(2;1\right)-3\left(3;4\right)+\left(7;2\right)=\left(2;-8\right)\)
c.
\(\overrightarrow{w}+\overrightarrow{a}=\overrightarrow{b}-\overrightarrow{c}\Rightarrow\overrightarrow{w}=\overrightarrow{b}-\overrightarrow{c}-\overrightarrow{a}\)
\(\Rightarrow\overrightarrow{w}=\left(3;4\right)-\left(7;2\right)-\left(2;1\right)=\left(-6;1\right)\)