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

Toán Lớp 7: $\dfrac{- 6}{21}$ `.` $\dfrac{3}{2}$

Toán Lớp 7: $\dfrac{- 6}{21}$ . $\dfrac{3}{2}$

Comments ( 2 )

  1. $@Zeng$
    $\frac{-6}{21}.$ $\frac{3}{2}=$ $\frac{-6.3}{21.2}=$ $\frac{-18}{42}=$ $\frac{-3}{7}$
     

  2. ( – 6 )/21 . 3/2 = ( – 3 )/7
    ** Giải thích :
    ( – 6 )/21 . 3/2 = ( ( – 6 ) . 3 )/( 21 . 2 ) = ( ( – 3 ) . 2 . 3 )/( 3 . 7 . 2 ) = ( – 3 )/7

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

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