(4x+______)2=16x2+______+9y2.
根据题意得:(4x+3y)2=16x2+24xy+9y2.
故答案为:3y;24xy
[ ]
A. I'm sorry. I'm new here.
B. Why do you ask me?
C. Who knows.
说明硬蜱与软蜱的主要形态与生活习性差异