999*778+333*666
=999×778+333×(3×222)
=999×778+(333×3)×222
=999×778+999×222
=999×(778+222)
=999×1000
=999000
乘法分配率 关键是要找到(拆配出来) 相同的因数哦
999*778+333*666
=999*778+333*3*222
=999*778+999+222
=999*(778+222)
=999*1000
=999000
999×778+333×666
=(999×778)+(333×3×222)
=999×(778+222)
=999×1000
=999000
999*778+333*666
=999x778+333x3x222
=999x(778+222)
=999x1000
=999000