作业帮(784*322-213)/(321*784+571)的简便运算
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(784*322-213)/(321*784+571)的简便运算
(784*322-213)/(321*784+571)的简便运算
(784*322-213)/(321*784+571)的简便运算
(784*322-213)/(321*784+571)
=(784*321+784-213)/(321*784+571)
=(321*784+571)/(321*784+571)
=1
(784*322-213)/(321*784+571)
=[784*(321+1)-213]/(321*784+571)
=(784*321+784*1-213)/(321*784+571)
=(321*784+571)/(321*784+571)
=1
=(784+784*321-213)/(321*784+571)=(784*321+571)/(321*784+571)=1