Question

【题目】简便计算：4.7×0.35＋0.47×4.2＋0.047×23

Answer 1

【答案】解：4.7×0.35＋0.47×4.2＋0.047×23

=4.7×0.35＋4.7×0.42＋4.7×0.23

=(0.35＋0.42＋0.23)×4.7

=1×4.7

=4.7

【解析】

根据积不变的规律，把0.47×4.2写成4.7×0.42，把0.047×23写成4.7×0.23，然后运用乘法分配律简便计算即可.