Question

вычислите 55,6^2 - 55,5^2
даю 10 баллов ​

Answer 1

a² - b² = (a - b)(a + b)
55.6² - 55.5² = (55.6 - 55.5)(55.6 + 55.5) = 0.1 * 111.1 = 11.11

Answer 2

55,6²-55,5²=$(\frac{278}{5}) ^{2}-(\frac{111}{2}) ^{2}=\frac{77284}{25}-\frac{12321}{4}=\frac{1111}{100}=11\frac{11}{100}$ или 11,11