а(1+х)*(1-х) = 1 - x^2
б(x-у)*(x+у) = x^2 - у^2
в(2а+b)*(a+2b) = 2a^2 + ab + 2ab + 2b^2 = 2a^2 + 3ab + 2b^2
г(5m+7n)*(2n+4m) = 10mn + 20m^2 + 14n^2 + 28mn = 20m^2 + 38mn + 14n^2
д(2x-3y)*(2x+3y) = 4x^2 - 9y^2
е(-a-b)*(2a-3b) = -2a^2 + 3ab + 2ab - 3b^2 = -2a^2 + 5ab - 3b^2
ж(2x^2-y^2)*(y^2+2x^3) = 2x^2y^2 + 4x^5 - y^4 - 2x^3y^2
а
(1+х)*(1-х) = 1 - x^2
б
(x-у)*(x+у) = x^2 - у^2
в
(2а+b)*(a+2b) = 2a^2 + ab + 2ab + 2b^2 = 2a^2 + 3ab + 2b^2
г
(5m+7n)*(2n+4m) = 10mn + 20m^2 + 14n^2 + 28mn = 20m^2 + 38mn + 14n^2
д
(2x-3y)*(2x+3y) = 4x^2 - 9y^2
е
(-a-b)*(2a-3b) = -2a^2 + 3ab + 2ab - 3b^2 = -2a^2 + 5ab - 3b^2
ж
(2x^2-y^2)*(y^2+2x^3) = 2x^2y^2 + 4x^5 - y^4 - 2x^3y^2