问题
填空题
用简便方法计算:
503×497=______;1.02×0.98=______
答案
503×497,
=(500+3)(500-3),
=5002-32,
=249991;
1.02×0.98,
=(1+0.02)(1-0.02),
=1-0.022,
=0.9996.
故本题答案为:249991,0.9996.
用简便方法计算:
503×497=______;1.02×0.98=______
503×497,
=(500+3)(500-3),
=5002-32,
=249991;
1.02×0.98,
=(1+0.02)(1-0.02),
=1-0.022,
=0.9996.
故本题答案为:249991,0.9996.