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计算下面各题 能简算的要简算.①12+14+18+116+132+164②88888×888

2022-08-14 02:36:05 问答库 阅读 200 次

问题详情

计算下面各题,能简算的要简算.
①1

2

+1

4

+1

8

+1

16

+1

32

+1

64


②88888×88889+44444×22222

③1

19

+202

1919

+30303

191919

-4040404

19191919

+505050505

1919191919



④1-(1

2

-1

3

)-(1

3

-1

4

)-(1

4

-1

5

)-(1

5

-1

6

).

参考答案

①12+14+18+116+132+164,
=1-12+12-14+14-18+18-116+116-132+132-164,
=1-164,
=6364;

②88888×88889+44444×22222,
=88888×88889+88888×11111,
=88888×(88889+11111),
=88888×100000,
=8888800000;

③119+2021919+30303191919-404040419191919+5050505051919191919,
=119+2×10119×101+3×1010119×10101-4×101010119×1010101+5×10101010119×101010101,
=119+219+319-419+519,
=1019;

④1-(12-13)-(13-14)-(14-15)-(15-16),
=1-12+13-13+14-14+15-15+16,
=1-12+16,
=23.

考点: