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

Toán Lớp 5: 7/8 × 7/9 + 7/9 × 5/8 – 7/9 × 3/8 + 1/8

Toán Lớp 5: 7/8 × 7/9 + 7/9 × 5/8 – 7/9 × 3/8 + 1/8

Comments ( 2 )

  1. $\frac{7}{8}$ x $\frac{7}{9}$ + $\frac{7}{9}$ x $\frac{5}{8}$ – $\frac{7}{9}$ x $\frac{3}{8}$ + $\frac{1}{8}$ 
    = $\frac{7}{9 }$ x ( $\frac{7}{8}$ + $\frac{5}{8}$ – $\frac{3}{8}$) + $\frac{1}{8}$ 
    = $\frac{7}{9 }$ x $\frac{9}{8}$  + $\frac{1}{8}$ 
    = $\frac{7}{1 }$ x $\frac{1}{8}$  + $\frac{1}{8}$ 
    = $\frac{7}{8 }$  + $\frac{1}{8}$ 
    = $\frac{8}{8 }$  
    = 1
    Chúc bạn học tốt

  2. 7/8 xx 7/9 + 7/9 xx 5/8 – 7/9 xx 3/8 +1/8
    =7/9 xx (7/8+5/8-3/8)+1/8
    =7/9 xx 9/8+1/8
    =7/8+1/8
    =8/8
    =1

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