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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 10: giai toan tap hop liet ke 1) G= {x|x=3k+1,k thuoc z, -1

Toán Lớp 10: giai toan tap hop liet ke
1) G= {x|x=3k+1,k thuoc z, -1

Comments ( 1 )

  1. AH=vec{AB}+vec{BH}
    =vec{AB}+1/5vec{BC}
    AK=vec{AB}+vec{BK}
    =vec{AB1}+1/6vec{BD}
    =vec{AB}+1/6(vec{BC}+vec{BA})
    =vec{AB}+vec{BC}-1/6vec{AB}
    =5/6vec{AB}+1/6vec{BC}
    b)
    ta có:
    5/6vec{AH}=5/6(vec{AB}+1/5vec{BC})
    =5/6vec{AB}+1/6vec{BC}=vec{AK}
    vậy AK =5/6AH
    vậy A,K,H thẳng hàng

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222-9+11+12:2*14+14 = ? ( )