301×79的简便运算只限3个小时

（300+1）*79
= 23700+79
=23779

301×79
=(300+1)×79
=23700+79
=23779

301×79=(300+1)×79=23700+79=23779

300乘79＋79

301×79
= 79×(300+1)
= 79×300 + 79
= 300×(80-1) + 79
= 24000 - 300 + 79
= 23779

301×80—301=23679