30/0.25+30/0.75 简便计算
问题描述:
30/0.25+30/0.75 简便计算
答
30/0.25+30/0.75=3000/25+3000/75=3000/25+1000/25=4000/25=40*4=160
答
0.25=1/4
0.75=3/4
∴30/0.25+30/0.75=30/(1/4)+30/(3/4)=30*4+(30/3)*4=160