a_7; b_7; c_2; a_gamma Thu gon 5x ^ 2 - 3x(x + 2); - Dicamon

Question

a_7; b_7; c_2; a_gamma Thu gon 5x ^ 2 - 3x(x + 2); 3x ^ 2 * y(2x ^ 2 - y) - 4x ^ 2 * (x ^ 2 * y - y ^ 2); (x - 1)(x ^ 2 + x + 1) - x(x ^ 2 + 5); 1/2 * x ^ 2 * y

Answer

a) 5x ^ 2 - 3x(x + 2); =5x^ 2 -3x^ 2 -6x; =2x^ 2 -6x; b)3x^ 2 y(2x^ 2 -y)-4x^ 2 (x^ 2 y-y^ 2 ); =6x^ 4 y-3x^ 2 y^ 2 -4x^ 4 y+4x^ 2 y^ 2; =2x^ 4 y+x^ 2 y^ 2; (x - 1)(x ^ 2 + x + 1)

Giúp mình câu c d với