从上面选择一道小题,我思考的过程或解答的依据是.
1.3×9= 3.6÷0.6= 4.2÷7= 72= 7.5a﹣2.3a=
4.2÷7= 2÷4= 2.3×0.2= 1.25+3.8= 0.35÷5=