hinh 10

X

xubong9x208

1,ap dug cog thuc goc giua 2vecto o trag 44 la dc.
Vecto(3m+n)=(1,9) vecto(m-2n)=(5,-4) roi cug ap dug cogthuc la dc
2,ban viet thieu thi phaj,dag le la phaj vecto(am+bn)ms dug chu,xem laj de da nhe
 
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