Question

7.5×2.3-0.5×2.5+22.5×0.4的简便方法？

求大神来解答

Answer 1

简便计算 7.5×2.3十1.9×2.5十22.5×0.4 =2.5×6.9十1.9×2.5十2.5×3.6 =2.5x(6.9十1.9+3.6)=2.5x12.4 =2.5x4x3.1 =10x3.1 =31

Answer 2

=2.5×3×2.3-0.5×2.5+9×2.5×0.4
=2.5×(6.9-0.5+3.6)
=2.5×10
=25