(1) 8.64/{64.8-(48.6-2.7 *2)}=0.4
(2) 3.7*4.7+6.3*3.7-3.7=3.7*(4.7+6.3-1)=3.7*10=37
(3) 2.5*1.9+25*0.71+0.25*1=2.5*(1.9+7.1+0.1)=2.5*9.1=22.75
(4) (12.5+12.5+12.5+12.5)*2.5=4*12.5*2.5=4*2.5*12.5==10*12.5=125
能巧算的要巧算：1 8.64/{64.8-（48.6-2.7*2）} 2 3.7*4.7+6.3*3.7-3.7 32.