简便运算:21/【(2/3+2/5)*30/(3又5/42-2又5/14)】
问题描述:
简便运算:21/【(2/3+2/5)*30/(3又5/42-2又5/14)】
答
=21/{32/(3+5/42-2-5/14)}=21/[32*(42/32)]=1/2
简便运算:21/【(2/3+2/5)*30/(3又5/42-2又5/14)】
=21/{32/(3+5/42-2-5/14)}=21/[32*(42/32)]=1/2