问题
填空题
计算:(-2a2)(-3a3)=______;(2x+5)(x-5)=______.
答案
(-2a2)(-3a3)=(-2)×(-3)×a2•a3=6a5;
(2x+5)(x-5),
=2x2-10x+5x-25,
=2x2-5x-25.
计算:(-2a2)(-3a3)=______;(2x+5)(x-5)=______.
(-2a2)(-3a3)=(-2)×(-3)×a2•a3=6a5;
(2x+5)(x-5),
=2x2-10x+5x-25,
=2x2-5x-25.