答：
23.5×0.4+0.24÷0.4
=47×0.5×0.4+6×0.4÷0.4
=47×0.2+6
=9.4+6
=15.4为什么是6×0.4？弄错了，sorry

答：
23.5×0.4+0.24÷0.4
=47×0.5×0.4+0.6×0.4÷0.4
=47×0.2+0.6
=9.4+0.6
=10