2有8分之5-8分之5除以2有2分之1,11分之4除以0.125乘1有8分之3

问题描述:

2有8分之5-8分之5除以2有2分之1,11分之4除以0.125乘1有8分之3


1、原式=21/8-5/8÷5/2
=21/8-5/8X2/5
=21/8-2/8
=19/8
2、原式=4/11÷0.125X11/8
=4/11÷125/1000X11/8
=4/11X8X11/8
=4