7/12×1/7+5/12÷7
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7/12×1/7+5/12÷77/12×1/7+5/12÷77/12×1/7+5/12÷7=7/12×1/7+5/12×1/7=(7/12+5/12)×1/7=1×1/7=1/77/12×1/7+5/
7/12×1/7+5/12÷7
7/12×1/7+5/12÷7
7/12×1/7+5/12÷7
=7/12×1/7+5/12×1/7
=(7/12+5/12)×1/7
=1×1/7
=1/7
7/12×1/7+5/12÷7
=7/12×1/7+5/12*1/7
=(7/12+5/12)*1/7
=1*1/7
=1/7