(1+2/5+1/2÷3/4)×2/7 用简便方法解答

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(1+2/5+1/2÷3/4)×2/7用简便方法解答(1+2/5+1/2÷3/4)×2/7用简便方法解答(1+2/5+1/2÷3/4)×2/7用简便方法解答(1+2/5+1/2×4/3)×2/7

(1+2/5+1/2÷3/4)×2/7 用简便方法解答
(1+2/5+1/2÷3/4)×2/7 用简便方法解答

(1+2/5+1/2÷3/4)×2/7 用简便方法解答
(1+2/5+1/2×4/3)×2/7