括号2.8+3点吧5÷3.5括号乘以0.2简便计算

（2.8+3.85）÷3.5×0.2
=2.8×0.2÷3.5+3.85×0.2÷3.5
=0.7×0.8÷0.7÷5+1.1×0.2
=0.8÷5+0.22
=0.16+0.22
=0.38

(2.8+3.85÷3.5)x0.2
=(2.8+1.1)x0.2
=3.9x0.2
=0.78