299 778+333+666简便算法299×778+333+666
问题描述:
299 778+333+666简便算法
299×778+333+666
答
299×778+333+666
=(300-1)×778+999
=233440-778+(778+221)
=233440-778+778+221
=233440+221
=233661
答
299 778+333+666
= 299 778+999
= 299 777+1000
= 300 777
答
299 778+333+666
=299 777+333+666+1
=299 777+1000
=300777