问题:
(2a+3b) 2=(2a-3b) 2+( ),括号内的式子是
A.6ab
B.24ab
C.12ab
D.18ab
(2a+3b) 2=(2a-3b) 2+( ),括号内的式子是
A.6ab
B.24ab
C.12ab
D.18ab
A.6ab
B.24ab
C.12ab
D.18ab
参考答案: