Question

Вычислите выражение()_()

Answer 1

$\cfrac{2,45^2+4,9*3,55+3,55^2}{4,23^2-4,23*2,46+1,23^2}=\cfrac{2,45^2+2*2,45*3,55+3,55^2}{4,23^2-2*1,23*4,23+1,23^2}=\\\cfrac{(2,45+3,55)^2}{(4,23-1,23)^2}=(\frac{2,45+3,55}{4,23-1,23})^2=(\frac{6}{3})^2=2^2=4$

Answer 2

(2,45²+2*2,45+3,55²)/(4,23-2*4,23*1,23)²=(2,45+3,55)²/(4,23-1,23)²
=6²/3²=36/9=4