怎样简便怎样算. 0.81×99+0.81 0.
答案:1 悬赏:80 手机版
解决时间 2021-02-15 04:51
- 提问者网友:且恨且铭记
- 2021-02-14 20:36
怎样简便怎样算. 0.81×99+0.81 0.
最佳答案
- 五星知识达人网友:你哪知我潦倒为你
- 2021-02-14 21:12
(1)0.81×99+0.81,
=0.81×(99+1),
=0.81×100,
=81;
(2)0.25×(85+85+85+85),
=0.25×(85×4),
=0.25×4×85,
=1×85,
=85;
(3)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(4)82.2×9.9,
=82.2×(10-0.1),
=82.2×10-82.2×0.1,
=822-8.22,
=813.78.
=0.81×(99+1),
=0.81×100,
=81;
(2)0.25×(85+85+85+85),
=0.25×(85×4),
=0.25×4×85,
=1×85,
=85;
(3)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(4)82.2×9.9,
=82.2×(10-0.1),
=82.2×10-82.2×0.1,
=822-8.22,
=813.78.
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