题目
下列一定正确的是()A. (A + B)(A - B) = A^2 + B^2B. (A + B)^2 = A^2 + B^2 + 2ABC. (A + E)^2 = A^2 + 2A + ED. (A - B)^2 = A^2 - 2AB + B^2
下列一定正确的是()
A. $(A + B)(A - B) = A^2 + B^2$
B. $(A + B)^2 = A^2 + B^2 + 2AB$
C. $(A + E)^2 = A^2 + 2A + E$
D. $(A - B)^2 = A^2 - 2AB + B^2$
题目解答
答案
C. $(A + E)^2 = A^2 + 2A + E$