784x322-213/321x784+571简便计算
问题描述:
784x322-213/321x784+571简便计算
答
784x322-213/321x784+571
=【784×(321+1)-213】/(321×784+571)
=(784×321+784-213)/(321×784+571)
=(784×321+571)/(784×321+571)
=1