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

Toán Lớp 5: tính bằng cách thuận tiện nhất 4/5 x 6/8 + 4/5 x 2/8

Toán Lớp 5: tính bằng cách thuận tiện nhất 4/5 x 6/8 + 4/5 x 2/8

Comments ( 2 )

  1. 4/5 xx 6/8 + 4/5 xx 2/8
    =4/5 xx (6/8 + 2/8) = 4/5 xx 8/8 = 4/5 xx 1 = 4/5

  2. $\dfrac{4}{5}\times \dfrac{6}{8}+\dfrac{4}{5}\times \dfrac{2}{8}$
    $=\dfrac{4}{5}\times \left(\dfrac{6}{8}+\dfrac{2}{8}\right)$
    $=\dfrac{4}{5}\times \left(\dfrac{3}{4}+\dfrac{1}{4}\right)$
    $=\dfrac{4}{5}\times \:1$
    $=\dfrac{4}{5}$

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