（1）12.7+12.5÷5 =12.7+2.5=15.2 （2）（7.5-2.3×0.4）÷0.01=（7.5-0.92）÷0.01=6.58÷0.01=658（3）2.16÷0.9÷0.3 =2.16÷（0.9×0.3）=2.16÷0.27=8（4）78÷0.25÷0.4=78÷（0.25×0.4）=78÷0.1=780
