8*6.9+2.6*79.3简便算
问题描述：
8*6.9+2.6*79.3简便算
答
7.8×6.9+2.6×79.3
=（2.6×3）×6.9+2.6×79.3
=2.6×20.7+2.6×79.3
=2.6×（20.7+79.3）
=2.6×100
=260