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：2024/09/10 18:42:10

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