§ 13.1 (1) 9 ≤ x ≤ 11
§ 13.2 (1) 2.75 ̇ = \(\frac{124}{125}\)
§ 13.3 (1) 8 x 10-4 < 6 x 10-4 <4 x 10-2<0.07
(2) 3-6 – \(\sqrt{841}\) = 700
§ 13.4 (1) \(\sqrt{0.444444}\) = \(\frac{2}{3}\)
(2) \(\sqrt{80}\) – \(\sqrt{2\frac{2}{9}} = 10\frac{\sqrt{5}}{3}\)
§ 13.5 (1) \(\frac{a}{b}\)= \(\frac{20}{3}\)
§ 13.6 (1) (a)\(\frac{\sqrt{2}}{2}\) (b) \(-3 +2\sqrt{2}\)
(2) =40
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