Question

能简便的用简便方法!21÷0.25÷0.4 4.26×2.5+2.35 9.85÷12.5÷8

Answer 1

21÷0.25÷0.4 =21÷（0.25×0.4）=21÷0.1=21

4.26×2.5+2.35=10.65+2.35=13 （不能用简便方法）

9.85÷12.5÷8=9.85÷（12.5×8）=9.85÷100=0.0985