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

Toán Lớp 8: tìm x : -3/4.x=7/16 x:(-3 và 6/7 ) = -9/21

Toán Lớp 8: tìm x :
-3/4.x=7/16
x:(-3 và 6/7 ) = -9/21

Comments ( 2 )

  1. $#Shin$
    $\frac{-3}{4}$ . x = $\frac{7}{16}$ 
                            x = $\frac{7}{16}$ : $\frac{-3}{4}$ 
                            x = $\frac{-7}{12}$ 
    x : ( $-3$$\frac{6}{7}$ ) = $\frac{-9}{21}$ 
    x : $\frac{-15}{7}$         = $\frac{-9}{21}$ 
    x                                   = $\frac{-9}{21}$ . $\frac{-15}{7}$ 
    x                                   = $\frac{45}{49}$ 
    #nkh
     

  2. -3/4 . x = 7/16
    $\Leftrightarrow$ x = 7/16 : -3/4
    $\Leftrightarrow$ x = 7/16 . -4/3
    $\Leftrightarrow$ x = -7/12
    $\text{Vậy}$ x = -7/12
    _____________________
    x : (-3 6/7) = -9/21
    $\Leftrightarrow$ x : {-27}/7 = -9/21
    $\Leftrightarrow$ x = -9/21 . -27/7
    $\Leftrightarrow$ x = 81/49
    $\text{Vậy}$ x = 81/49
     

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

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