解:3/25+3/4等于(87/100)∵已知需求出3/25+3/4等于多少X+Y=Z∴3/25+3/4=(3×4)/(25×4)+(3×25)/(4×25)=12/100+75/100=(12+75)/100=87/100答:3/25+3/4等于87/100