0.9+0.99+0.999+0.9999+0.99999 3333×3333.
问题描述:
0.9+0.99+0.999+0.9999+0.99999
3333×3333.
答
(1)0.9+0.99+0.999+0.9999+0.99999,
=(1-0.1)+(1-0.01)+(1-0.001)+(1-0.0001)+(1-0.00001),
=5-0.11111,
=4.88889;
(2)3333×3333,
=3333×(1111×3),
=(3333×3)×1111,
=9999×1111,
=(10000-1)×1111,
=11110000-1111,
=11108889.