0.25乘19加0.75乘25的简便运算？

0.25*19+0.25*3*25=0.25*94=0.25*100-0.25*6=23.5

0。25*19+0。75*25=（19+75）/4=23。5
把0。75*25看作0。25*75
把*0。25看作除以4，用乘法结合律

0.25*19+0.75*25
=0.25*（15+4）+0.75*100*0.25
=0.25*15+1+75*0.25
=0.25*（15+75）+1
=0.25*90+1
=0.25*（100-10）+1
=25-2.5+1
=23.5

0.25*19+0.75*25
=0.25*19+0.25*(25*3)
=0.25*(19+75)
=0.25*94
=0.25*100-0.25*6
=25-1.5
=23.5

0.25*19+0.75*25
=(19+75)*0.25
=94*0.25
=(90+4)*0.25
=90*0.25+4*0.25
=22.5+1
=23.5

乘用*表示
0.25*19+0.75*25=0.25*19+0.75*19+0.75*6=
(0.25+0.75)*19+0.75*6=19+4.5=23.5