问题
解答题
用乘法公式计算:(1)59.8×60.2;(2)1982
答案
(1)59.8×60.2,
=(60-0.2)(60+0.2),
=602-0.22,
=3599.96;
(2)1982,
=(200-2)2,
=2002-2×200×2+22,
=39204.
用乘法公式计算:(1)59.8×60.2;(2)1982
(1)59.8×60.2,
=(60-0.2)(60+0.2),
=602-0.22,
=3599.96;
(2)1982,
=(200-2)2,
=2002-2×200×2+22,
=39204.