(14x3\5+2\5x14)x2\7

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(14x3\5+2\5x14)x2\7(14x3\5+2\5x14)x2\7(14x3\5+2\5x14)x2\7yf256984,(14×3/5+2/5×14)×2/7=14×(3/5+2/5)×2

(14x3\5+2\5x14)x2\7
(14x3\5+2\5x14)x2\7

(14x3\5+2\5x14)x2\7
yf256984,
(14×3/5+2/5×14)×2/7
=14×(3/5+2/5)×2/7
=14×1×2/7
=4