Câu hiện phép tính: 1) 5x(5-x)+(x+1)(5x-3) 2) (x-3)^2-(x-2)(x+2)+12x . 3) (1)/(2)

1) For the first expression, we need to apply the distributive property (a(b + c) = ab + ac) and then combine like terms. - becomes - becomes which simplifies to - Combining these results in which simplifies to 2) For the second expression, we need to expand the squared term and the product, then combine like terms. - expands to - expands to - Combining these with gives which simplifies to 3) The third expression is a fraction and does not require any operations. It remains