Có \(\overrightarrow{MA}+k\overrightarrow{MB}+\left(1-k\right)\overrightarrow{MC}=\overrightarrow{0}\)

\(\Leftrightarrow\left(\overrightarrow{MA}+\overrightarrow{MC}\right)+k\left(\overrightarrow{MB}-\overrightarrow{MC}\right)=\overrightarrow{0}\)       (1)

Gọi N là trung điểm của AC thì 

(1) \(\Leftrightarrow2\overrightarrow{MN}+k\overrightarrow{CB}=\overrightarrow{0}\)

\(\Leftrightarrow\overrightarrow{NM}=\dfrac{k}{2}\overrightarrow{CB}\)      (2)

Vậy điểm M là điểm thỏa mãn \(\overrightarrow{NM}=\dfrac{k}{2}\overrightarrow{CB}\) với N là trung điểm AC.

my name is kelvin.im nine year old.I go to Tran Dai Nghia school.my favorite subject are math and english.because they are very interesting.in my free time,i always plya soccer with my friends.in the future,i want to sciencetist .because.i wantto help the country

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bằng 2

1 + 1 = 2

We started working on this programme 5 years ago

Program HOC24;

var x: integer;

begin

write('Nhap so: '); readln(x);

if x mod 2=0 then write('La so chan') else write('La so le');

readln;

end.