№ 562
102 + 112 + 122 = 132 + 142102 = 142 – 122 + 132 – 112102 = (14 – 12)(14 + 12) + (13 – 11)(13 + 11)102 = 2 • 26 + 2 • 24102 = 2 • 50102 = 100102 = 102
вправи поруч