几道数学题3.17乘4.5+5.5乘3.17简便计算怎么算?3.17*4.5+5.5*3.171.25*3.2*2.5简便计算

问题描述:

几道数学题3.17乘4.5+5.5乘3.17简便计算怎么算?
3.17*4.5+5.5*3.17
1.25*3.2*2.5简便计算

求采纳:
1 原式=3.17*(4.5+5.5)=3.17*10=31.7
2 原式=1.25*(0.4*8)*2.5=(1.25*8)*(2.5*0.4)=10*1=10

3.17*(4.5+5.5)=31.7 1.25*8*0.4*2.5=10

3.17乘4.5+5.5乘3.17
=3.17x(4.5+5.5)
=3.17x10
=31.7
1.25*3.2*2.5
=1.25*8*0.4*2.5
=10*1
=10

3.17乘4.5+5.5乘3.17
=3.17x(4.5+5.5)
=3.17x10
=31.7

1.25*3.2*2.5
=1.25*8*0.4*2.5
=10*1
=10

不懂可追问,有帮助请采纳,谢谢!