1、3.64÷4+4.36×25% 2、3.6-2.8+7.4-7.2 3、6.42×1.01-6.42
=3.64×1/4+4.36×1/4 =（3.6+7.4）-（2.8+7.2) =6.42×1.01-6.42×1
=（3.64+4.36）×1/4 =11-10 =6.42×（1.01-1）
=8×1/4 =1 =6.42×0.01
=2 =0.0642