12.6/6.3
=12.6÷3÷2.1
=4.2÷2.1
=2
数字错误修改了那3.75*0.89简算，脱式计算3.75×0.89=3.75×（1-0.11）=3.75-3.75×0.11=3.75-0.4125=3.3375