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Cet-6-1.6-Exercise 01With information no longer controlled by travel agents or hidden in business networks, the travel industry was revolutionized, as greater transparency helped ______ prices.
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Cet-6-1.6-Exercise 02Innovation, the elixir of progress, has always cost people their jobs. In the Industrial Revolution hand weavers were ______ aside by the mechanical loom. Over the past 30 years the digital revolution has displaced many of the mid-skill jobs that supported 20th-century middle-class life. Typists, ticket agents, bank tellers and many production-line jobs have been dispensed with, just as the weavers were.
若（a,c）=1,(b,c)=1则（ab,c）=（）。
对于任意a∈Z，若p为素数，那么（p,a）等于（）。
所有大于1的素数所具有的公因数的个数都是相等的。（）
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