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*3.171.25*3.2*2.5简便计算

应是两题?
3.17×4.5+5.5×3.17
=3.17×(4.5+5.5)
=3.17×10
=31.7

1.25×3.2×2.5
=1.25×8×4×2.5÷10
=10×10÷10
=10

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

3.17*4.5+5.5*3.17
=3.17x(4.5+5.5)
=3.17x10
=31.7
1.25*3.2*2.5
=1.25x8x0.4x2.5
=10x1
=10