7.6×0.8+0.2×7.6
=（0.8+0.2）×7.6
=1×7.6
=7.6
0.25×36
=0.25×（4×9)
=(0.25×4)×9
=1×9
=9
0.85×99
=0.85×(100-1)
=0.85×100-0.85×1
=85-0.85
=84.15这是我的回答希望采纳哦(ˇˍˇ）