299 778+333+666简便算法299×778+333+666

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299 778+333+666简便算法299×778+333+666
299 778+333+666简便算法
299×778+333+666

299 778+333+666简便算法299×778+333+666
299 778+333+666
=299 777+333+666+1
=299 777+1000
=300777

299 778+333+666
= 299 778+999
= 299 777+1000
= 300 777

299×778+333+666
=(300-1)×778+999
=233440-778+(778+221)
=233440-778+778+221
=233440+221
=233661