问题
解答题
运用乘法公式简便计算:
(1)(998)2
(2)197×203
答案
(1)(998)2,
=2,
=1 000 000-4000+4,
=996004;
(2)197×203,
=(200-3)(200+3),
=2002-32,
=40 000-9,
=39991.
运用乘法公式简便计算:
(1)(998)2
(2)197×203
(1)(998)2,
=2,
=1 000 000-4000+4,
=996004;
(2)197×203,
=(200-3)(200+3),
=2002-32,
=40 000-9,
=39991.