简便方法算9999×7778×3333×6666 (425×5775+4225×425)÷128÷8
1个回答

9999*7778+3333*6666

=9999×7778+3333×3×2222

=9999×7778+9999×2222

=9999×(7778+2222)

=9999×10000

=99990000

(425*5775+4225*425)/125/8

=425(5775+4225)/1000

=425*1000/1000

=425