-72*(1/4-5/9+7/12)/(-2)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/08 00:49:27
-72*(1/4-5/9+7/12)/(-2)
-72*(1/4-5/9+7/12)/(-2)
-72*(1/4-5/9+7/12)/(-2)
=-72X（9/36-20/36+21/36）/(-2)
=-72X（-11/36+21/36）/(-2)
=-72X(10/36)/(-2)
=-72X(-5/9)
=40
-72*(1/4-5/9+7/12)/(-2)
-72*(1/4-5/9+7/12)/(-2)
-72*(1/4-5/9+7/12)/(-2)
=-72X（9/36-20/36+21/36）/(-2)
=-72X（-11/36+21/36）/(-2)
=-72X(10/36)/(-2)
=-72X(-5/9)
=40