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

Toán Lớp 7: `B=-4+3-1/6+1/7` `C=35/6:(-43)/42`

Toán Lớp 7: B=-4+3-1/6+1/7
C=35/6:(-43)/42

Comments ( 2 )

  1. Giải đáp:
    B = -4 + 3 – $\frac{1}{6}$ + $\frac{1}{7}$ 
       = -1 –  $\frac{1}{6}$ + $\frac{1}{7}$ 
       = – $\frac{7}{6}$  + $\frac{1}{7}$
       = – $\frac{43}{42}$ 
    C = $\frac{35}{6}$ :  $\frac{-43}{42}$
       = $\frac{35}{6}$ . $\frac{-42}{43}$
       = $\frac{-245}{43}$

  2. B= -4 + 3 – 1/6 + 1/7
    B= -1 – 1/6 + 1/7
    B= -6/6 – 1/6+ 1/7
    B= -7/6 + 1/7
    B= -49/42 + 6/42
    B= -43/42
    Vậy B =- 43/42
    C= 35/6 : (-43/42)
    C= 35/6 . (-42/43)
    C= (-42 . 35)/(6. 43)
    C=-1470/258
    C=-245/43
    Vậy C= -245/43

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

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