1) ( 40 + 1)^2 = 40 ^2 + 2 * 40 * 1 + 1^2 = 1 600 + 80 + 1 = 1 680 + 1 = 1 681;2) (30 - 1)^2 = 30 ^2 - 2 * 30 * 1 + 1^2 = 900 - 60 + 1 = 840 + 1 = 841;3) (101)^2 = (100 + 1)^2 = 100 ^2 + 2 * 100 * 1 + 1^2 = 10 000 + 200 + 1 = 10 200 + 1 = 10 201;4) (99)^2 = (100 - 1)^2 = 100 ^2 - 2 * 100 * 1 + 1^2 = 10 000 - 200 + 1 = 9 800 + 1 = 9 801;5) (48)^2 = (50 - 2) ^2 = 50^2 - 2 * 50 * 2 + 2^2 = 2 500 - 200 + 4 = 2 300 + 4 = 2 304;6) (52)^2 = (50 + 2)^2 = 50^2 + 2 * 50 * 2 + 2^2 = 2 500 + 200 + 4 = 2 704;7) (3.5)^2 = (3 + 0,5)^2 = 9 + 3 + 0,25 = 12,25;8) (10.1)^2 = (10 + 0,1)^2 = 100 + 0,01 = 100,01.