解:5.6÷X-1.5=78.55.6÷X=78.5+1.55.6÷X=80X=5.6÷80X=0.07
5.6÷X一1.5=78.5,5.6÷X=78.5十1.5=80,X=5.6÷80=0.07
5.6÷ⅹ一1.5二78.5,5.6/ⅹ=80,ⅹ=80÷5.6二80÷28/5=80X5/28=100/7
5.6/x-1.5=78.5x=0.07
根据题意得5.6÷x-1.5=78.55.6÷x=78.5+1.55.6÷x=80x=5.6÷80x=0.07