Question

помогите решить это с помощью формул на доске!!!

Answer 1

${98}^{2} = {(100 - 2)}^{2} = \\ {100 }^{2} - 2 \times 100 \times 2 + {2}^{2} = \\ 10000 - 400 + 4 = 9604 \\ {99}^{2} = \ {(100 - 1)}^{2} = \\ {100}^{2} - 2 \times 100 \times 1 + {1}^{2} = \\10000 - 200 + 1 = 9801 \\ {103}^{2} = {(100 + 3)}^{2} = \\ {100}^{2} + 2 \times 100 \times 3 + {3}^{2} = \\ 10000 + 600 + 9 = 10609 \\ {56}^{2} = {(50 + 6)}^{2} = \\ {50}^{2} + 2 \times 50 \times 6 + {6}^{2} = \\ 2500 + 600 + 36 = 3136$