Question

34点4×4点5-345×6点42-123×4五怎么简便计算？

Answer 1

由题意得知，34.4×4.5-345×6.42-123×4.5 要进行简便计算，可以利用乘法结合律
34.4×4.5-345×6.42-123×4.5 =4.5×（34.4-123）-345×6.42
=-88.6×4.5-345×6.42
=-88.6×（4+0.5）-345×（6+0.4+0.02）
=-88.6×4-88.6×0.5-345×6-345×0.4-345×0.02
=-354.4-44.3-2070-138-6.9
=-2613.6

Answer 2

34.4×4.5－345×6.42－123×45
＝45(3.44－23×2.14－123)
＝45(3.44－49.22－123)
＝45×－168.78
＝－7595.1

Answer 3

34点4×4点5-345×6点42-123×4五 :
34.4x4.5-345x6.42-123x45
=154.8-2214.9-5535
= - 7595.1