题目内容
用简便方法计算:
503×497=______;1.02×0.98=______
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.
=(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.
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