7/12×1/7+5/12÷7
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/19 13:10:17
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