8/5×5.3＋5.7×8/5－0.625
问题描述：
8/5×5.3＋5.7×8/5－0.625
答
5/8×5.3＋5.7×5/8－0.625
＝5/8×5.3＋5.7×5/8－5/8
＝5/8x(5.3+5.7-1)
=5/8x10
=25/4
=6.25