（1）4.75+8.4÷（9.2-6.8） =4.75+8.4÷2.4 =4.75+3.5 =8.25 （2）1.2÷[2.5×（4.3-2.7）] =1.2÷[2.5×1.6] =1.2÷4 =0.3 （3）3.4×5.9+5.9×5.6+5.9 =（3.4+5.6+1）×5.9 =10×5.9 =59
