【1-(3/8-1/5)-3/4】×13又1/5

问题描述:

【1-(3/8-1/5)-3/4】×13又1/5

【1-(3/8-1/5)-3/4】×13又1/5
=【1-(15/40-8/40)-3/4】*(46/5)
=(1-7/40-30/40)*(46/5)
=(3/40)*(46/5)
=69/100