解:
311x15+811÷5
=311x15+(311+500)÷5
=311x15+311x1/5+500÷5
=311x(15+1/5)+100
=311x76/5+100
=311x76/5+100
=23636/5+100
=(23635+1)/5+100
=4727+1/5+100
=4827又1/5或4827.2
311x15十811÷5二311x(10十5)十162点2二311o十1555十162点2二4665十162点z二4827点2。根据法则先算乘除后算加法。乘得的4665加上除得的162点2所得的4827点2是解。