Question

下面各题怎样简便就怎样算．①4×0.8×2.5×12.5②（2.8+3.85÷3.5）×4

下面各题怎样简便就怎样算．①4×0.8×2.5×12.5②（2.8+3.85÷3.5）×4.6．

Answer 1

①4×0.8×2.5×12.5， =（4×2.5）×（0.8×12.5）， =10×10， =100； ②（2.8+3.85÷3.5）×4.6， =（2.8+1.1）×4.6， =3.9×4.6， =17.94．