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Mathematics, 04.10.2021 14:20 my7butterflies

*Hãy chứng minh theo chiều ngược lại a) Nếu I là trung điểm của đoạn thẳng

AB thì với mọi điểm M ta có :

vectơ MA + vectơ MB = 2 vectơ MI

b) Nếu G là trọng tâm của tam giác

ABC thì với mọi điểm M ta có vectơ MA + vectơ MB + vectơ MC

= 3 vectơ MG

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*Hãy chứng minh theo chiều ngược lại a) Nếu I là trung điểm của đoạn thẳng

AB thì với...
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