问题
填空题
简便计算:7.292-2.712=______.
答案
根据平方差公式得,
7.292-2.712=(7.29+2.71)(7.29-2.71),
=10×4.58,
=45.8;
故答案为:45.8.
简便计算:7.292-2.712=______.
根据平方差公式得,
7.292-2.712=(7.29+2.71)(7.29-2.71),
=10×4.58,
=45.8;
故答案为:45.8.