Question

упростите (a+b)² +2(a+b)(a-_b)+(a-b)²

Answer 1

a^2 + 2ab + b^2 + (2a + 2b)(a - b) + a^2 - 2ab + b^2 = 2a^2 + 2b^2 + 2a^2 - 2ab + 2ab - 2b^2 = 4a^2 - 2b^2