问题:
设(5a+3b) 2=(5a﹣3b) 2+A,则A=
[ ]
A.30ab
B.15ab
C.60ab
D.12ab
设(5a+3b) 2=(5a﹣3b) 2+A,则A=
B.15ab
C.60ab
D.12ab
[ ]
A.30ab B.15ab
C.60ab
D.12ab
参考答案: