问题
解答题
运用乘法公式计算:
(1)4(a-2)2-(2a+3)(2a-3);
(2)101×99.
答案
(1)4(a-2)2-(2a+3)(2a-3),
=4(a2-4a+4)-(4a2-9),
=4a2-16a+16-4a2+9,
=-16a+25;
(2)101×99,
=(100+1)(100-1),
=10000-1=9999.
运用乘法公式计算:
(1)4(a-2)2-(2a+3)(2a-3);
(2)101×99.
(1)4(a-2)2-(2a+3)(2a-3),
=4(a2-4a+4)-(4a2-9),
=4a2-16a+16-4a2+9,
=-16a+25;
(2)101×99,
=(100+1)(100-1),
=10000-1=9999.