问题
选择题
(-2x-3y)2等于( )
A.4x2-12xy-9y2
B.-4x2-12xy-9y2
C.4x2+12xy+9y2
D.4x2-12xy-9y2
答案
原式=4x2+12xy+9y2.
故选C.
(-2x-3y)2等于( )
A.4x2-12xy-9y2
B.-4x2-12xy-9y2
C.4x2+12xy+9y2
D.4x2-12xy-9y2
原式=4x2+12xy+9y2.
故选C.