用简便方法计算 13×2/3+0.34×2/7+1/3×13+5/7×0.34 (2)—257÷(简便方法
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用简便方法计算 13×2/3+0.34×2/7+1/3×13+5/7×0.34 (2)—257÷(简便方法
用简便方法计算 13×2/3+0.34×2/7+1/3×13+5/7×0.34 (2)—257÷(
简便方法
用简便方法计算 13×2/3+0.34×2/7+1/3×13+5/7×0.34 (2)—257÷(简便方法
13×2/3+0.34×2/7+1/3×13+5/7×0.34
=13×(2/3+1/3)+0.34×(2/7+5/7)
=13+0.34
=13.34