问题
填空题
计算:(3x-1)(2x+1)=______;
(x-3y)(x+3y)=______.
答案
(3x-1)(2x+1)=6x2+3x-2x-1=6x2+x-1;
(x-3y)(x+3y)=x2-9y2.
故答案为:6x2+x-1;x2-9y2.
计算:(3x-1)(2x+1)=______;
(x-3y)(x+3y)=______.
(3x-1)(2x+1)=6x2+3x-2x-1=6x2+x-1;
(x-3y)(x+3y)=x2-9y2.
故答案为:6x2+x-1;x2-9y2.