Question

Даю много баллов! 7 класс! (1/3 a-b)^2=

Answer 1

(1/3a-b)²=1/9a²-2/3ab+b²

Answer 2

$left(frac13a-bright)^2=left(frac13aright)^2-2cdotleft(frac13aright)cdot b+b^2=\ =frac19a^2-frac23ab+b^2$