0.25*39+0.75*27的简便运算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 19:14:16
![0.25*39+0.75*27的简便运算](/uploads/image/z/49282-34-2.jpg?t=0.25%2A39%2B0.75%2A27%E7%9A%84%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
0.25*39+0.75*27的简便运算
0.25*39+0.75*27的简便运算
0.25*39+0.75*27的简便运算
0.25*39+0.75*27
=0.25*3(13+27)
=0.25*3*4*10
=1*30
=30
0.25*39+0.75*27=0.25*39+0.25*3*27=0.25*(39+81)=0.25*120=30
0.25*39+0.75*27=(1-0.75)*39+0.75*27=39-0.75*39+0.75*27=39-2*0.75=37.5
原式=(0.25*3)*(39/3)+0.75*27
=0.75*13+0.75*27
=0.75*(13+27)
=0.75*40
=30
上式=3*13/4+27*3/4=3*(27+13)/4=3*10=30