4/5x4+2/5x2+1/5x16
问题描述：
4/5x4+2/5x2+1/5x16
答
4/5x4+2/5x2+1/5x16 用简便方法计算
答
4/5x4+2/5x2+1/5x16
=4/5x4+4/5x1+4/5x4
=(4+4+1)x4/5
=9x4/5
=7.2
答
-4/5×4+4/5+4/5×4
=4/5×(4+1+4)
=4/5×9
=36/5
=7又1/5
答
是