7.8×4.86÷3.9
问题描述：
7.8×4.86÷3.9
答
3.9*2*4.86÷3.9=2*4.86=9.72
答
先算7.8除以3.9，得2，再用2乘以4.86，就行了，很简单啊
答
7.8÷3.9×4.86
=2×4.86
=9.72
答
2*3.9*4.86÷3.9
=4.86*2
=9.72
答
7.8×4.86÷3.9
=7.8÷3.9×4.86
=2×4.86
=9.72