1/5÷(1/3÷1/4)÷(1/4÷1/5)÷(1/5÷1/6)÷(1/6÷1/7)【简便计算】
3个回答
=1/5÷1/3×1/4÷1/4×1/5÷1/5×1/6÷1/6×1/7
=1/5×3×1/7
=3/35
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