第2章 2.1

(1)

∣5∣=5|5| = 5

(2)

∣−3∣=3|-3| = 3

(3)

∣3−4∣=4−3|\sqrt{3} - 4| = 4 - \sqrt{3}

(4)

∣5−8∣+∣5−2∣=8−5+5−2=6|\sqrt{5} - 8| + |\sqrt{5} - 2| = 8 - \sqrt{5} + \sqrt{5} - 2 = 6

(5)

∣22−3∣−∣2−22∣=3−22−22+2=5−42|2\sqrt{2} - 3| - |2 - 2\sqrt{2}| = 3 - 2\sqrt{2} - 2\sqrt{2} + 2 = 5 - 4\sqrt{2}

解説: r31bn1z