9999×7778+3333×6666
=9999×7778+(2222x3)x6666
=9999×7778+(3x6666)x2222
=9999×7778+9999×2222
=9999×(7778+2222)
=9999×10000
=99990000
这么 清晰应该能看懂
采纳我的亲
计算机按一下
9999×7778+3333×6666
=9999×7778+9999×2222
=9999×(7778+2222)
=9999×10000
=99990000
=9999×7778+9999×2222
=9999×(7778+2222)
=9999×10000
=99990000