Cách làm cho bạn:
a) $\overrightarrow{a}=2\overrightarrow{i}+ 0\overrightarrow{j}$
=> $\overrightarrow{a}=(2;0)$
b) $\overrightarrow{b}=-3\overrightarrow{j}+5\overrightarrow{j}$
=> $\overrightarrow{b}=(-3;5)$
c) $\overrightarrow{c}=3\overrightarrow{i}-4\overrightarrow{j}$
=> $\overrightarrow{c}=(3;-4)$
d) $\overrightarrow{d}=0,2\overrightarrow{i}+\sqrt{3}\overrightarrow{j}$
=> $\overrightarrow{d}=(0,2;\sqrt{3})$
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