8.7 *9.9+0.87,63/0.21/3,

问题描述:

8.7 *9.9+0.87,63/0.21/3,

8.7 *9.9+0.87
=8.7*(9.9+0.1)
=8.7*10
=87
63/0.21/3
=63/(21/100)/3
=300/3
=100