问题:
若m-n=4,则2m 2-4mn+2n 2的值为
A.32
B.22
C.12
D.0
若m-n=4,则2m 2-4mn+2n 2的值为
A.32
B.22
C.12
D.0
A.32
B.22
C.12
D.0
参考答案: