784x322-213/321x784+571简便计算

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784x322-213/321x784+571简便计算784x322-213/321x784+571简便计算784x322-213/321x784+571简便计算784x322-213/321x784

784x322-213/321x784+571简便计算
784x322-213/321x784+571简便计算

784x322-213/321x784+571简便计算
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