问题
解答题
用简便方法计算
98×245
102×347.
答案
(1)98×245
=(100-2)×245
=100×245-2×245
=24500-490
=24010;
(2)102×347
=(100+2)×347
=100×347+2×347
=34700+694
=35394.
用简便方法计算
98×245
102×347.
(1)98×245
=(100-2)×245
=100×245-2×245
=24500-490
=24010;
(2)102×347
=(100+2)×347
=100×347+2×347
=34700+694
=35394.