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

Toán Lớp 8: Cho tam giác ABC bt MN//BC BM=3 AM=2 BC=6.5 tính Mn

Toán Lớp 8: Cho tam giác ABC bt MN//BC BM=3
AM=2 BC=6.5 tính Mn

Comments ( 2 )

  1. Xét Δ ABC có :
        MN//BC
    ⇒$\frac{MN}{BC}$= $\frac{AM}{AB}$ 
    ⇒MN=2,6

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