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五六年级：简便计算，1/5×27＋3/5×21＝？
五六年级：1/5×27＋3/5×21＝？乘法分配律与公因数
五～六年级简便计算86/95
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五六年级：1/5×27＋3/5×21＝？乘法分配律与公因数
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