问题
解答题
用乘法公式计算:
(1)972
(2)2011×2013-20122.
答案
(1)972=(100-3)2,
=1002-2×100×3+32,
=10000-600+9,
=9409;
(2)2011×2013-20122,
=×(2012+1)-20122,
=20122-1-20122,
=-1.
用乘法公式计算:
(1)972
(2)2011×2013-20122.
(1)972=(100-3)2,
=1002-2×100×3+32,
=10000-600+9,
=9409;
(2)2011×2013-20122,
=×(2012+1)-20122,
=20122-1-20122,
=-1.