Answered

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Find counterexamples to show that the statements in 9-12 are false.
∀x∈R,x≥1/x.
∀a∈Z,(a−1)/a is not an integer.
∀ positive integers m and n,m⋅n⩾m+n.
∀ real numbers x and y,√x+y=√x+√y.

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