解:一又3/4+0.25+2/5等于( 12/5 ),【即等于2.4】
∵已知需求出一又3/4+0.25+2/5等于什么
∴一又3/4 + 0.25 + 2/5
= (1×4+3)/4 + 25/100 + 2/5
= 7/4 + 1/4 + 2/5
= 8/4 + 2/5
= 2 + 2/5
= 10/5 + 2/5
= 12/5
= 2.4
答:一又3/4+0.25+2/5等于12/5,【即等于2.4】
一又3/4+0.25+2/5等于2.4;
一又3/4+0.25+2/5
=1.75+0.25+0.4
=2+0.4
=2.4