4/9×4+2/9×2+1/9×2(简便计算)哪位大哥哥大姐姐教教我吧!
问题描述:
4/9×4+2/9×2+1/9×2(简便计算)哪位大哥哥大姐姐教教我吧!
答
4/9×4+2/9×2+1/9×2
=4/9×2×2+2/9×2+1/9×2
=2×﹙4/9×2+2/9+1/9﹚
=2×﹙8/9+2/9+1/9﹚
=2×11/9
=22/9