简算如下:
9999 × 8889 + 3333 × 3333 + 9
= 9999 × 8889 + 9999 × 1111 + 9
= 9999 ×(8889 + 1111) + 9
= 9999 ×10000 + 9
= 99990000 + 9
= 99990009
9999乘8889加3333乘3333加9
=9999*8889+9999*1111+9
=9999*(8889+1111)+9
=9999*10000+9
=99990000+9
=99990009
9999*8889+3333*3333+9=9999*8889+3*1111*3333+9=9999*8889+9999*1111+9
=9999(8889+1111)+9=9999*10000+9=99990009
9999*(8889+1111)+9=99990009
9×1111×8889+9×1111×1111+9=9(1111×8889+1111x1111+1)