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

Toán Lớp 7: Thực hiện phép tính ( Tính nhanh nếu có thể) (-$\frac{5}{9}$). $\frac{3}{11}$ + (-$\frac{13}{28}$). $\frac{3}{11}$

Toán Lớp 7: Thực hiện phép tính ( Tính nhanh nếu có thể)
(-$\frac{5}{9}$). $\frac{3}{11}$ + (-$\frac{13}{28}$). $\frac{3}{11}$

Comments ( 2 )

  1. $\dfrac{-5}{9}$ . $\dfrac{3}{11}$ +$\dfrac{-13}{28}$ . $\dfrac{3}{11}$
    = $\dfrac{3}{11}$ . ( $\dfrac{-5}{9}$ + $\dfrac{-13}{28}$ )
    = $\dfrac{3}{11}$ . ( $\dfrac{-140}{252}$ + $\dfrac{-117}{252}$  )
    = $\dfrac{3}{11}$ . $\dfrac{-257}{252}$  
    = $\dfrac{-257}{924}$ 

  2. ( – 5/9 ) . 3/11 + ( – 13/28 ) . 3/11
    = 3/11 . [ ( – 5/9 ) + ( – 13/28 ) ]
    = 3/11 . ( – 257 )/252
    = ( – 257 )/924
    ** Nếu đề là ( – 5/9 ) . 3/11 + ( – 13/18 ) . 3/11
    = 3/11 . [ ( – 5/9 ) + ( – 13/18 ) ]
    = 3/11 . ( – 23/18 )
    = ( – 23 )/66

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