Question

(0,2х+0,3у)²
(0,4b-0,5c)²
C решение пж)))

Answer 1

1)(0,2х+0,3у)^2=(0,2b)^2+2×0,2x×0,3y+(0,3y)^2=0,04x^2+0,12xy+0,09y^2
2)(0,4b-0,5c)^2=(0,4b)^2- 2×0,4b×0,5c+(0,5с)^2=0,16b^2-0,40bc+0,25c^2