Question

999x778+333x666简便计算

Answer 1

999x778+333x666=333x3x778+333x3x222=999x（778+222）=999x1000=999000

Answer 2

999×778+333×666
=333×3×778+333×666
=333×（3×778+666）
=333×3×（778+222）
=999×1000
=999000