5.125×0.4×2.5×3.85+0.4怎么简算
答案:2 悬赏:80 手机版
解决时间 2021-04-15 10:48
- 提问者网友:蓝琪梦莎
- 2021-04-15 06:15
5.125×0.4×2.5×3.85+0.4怎么简算
最佳答案
- 五星知识达人网友:野味小生
- 2021-04-15 07:20
5.125×0.4×2.5×3.85+0.4怎么简算
解:采用结合律,
原式=5.125x(0.4x2.5)x3.85+0.4
=(5+0.125)x1x3.85+0.4
=5x3.85+0.125x3.85+0.4
=19.25+0.4+0.125x(3+0.8+0.05)
=19.65+0.125x3+0.125x0.8+0.125x0.05
=19.65+0.675+0.1+0.01965
=20.325+0.11965
=20.44465
解:采用结合律,
原式=5.125x(0.4x2.5)x3.85+0.4
=(5+0.125)x1x3.85+0.4
=5x3.85+0.125x3.85+0.4
=19.25+0.4+0.125x(3+0.8+0.05)
=19.65+0.125x3+0.125x0.8+0.125x0.05
=19.65+0.675+0.1+0.01965
=20.325+0.11965
=20.44465
全部回答
- 1楼网友:不如潦草
- 2021-04-15 07:55
5.125×0.4×2.5×3.85+0.4
=5.125×3.85+0.4
=5.125×3.85+0.4
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