0.6+7/12÷7/8-2/9
问题描述：
0.6+7/12÷7/8-2/9
答
0.6+7/12÷7/8-2/9
=0.6+7/12*8/7-2/9
=0.6+8/12-2/9
=0.6+2/3-2/9
=0.6+6/9-2/9
=0.6+4/9
=6/10+4/9
=54/90+40/90
=14/90
=7/45