89.1+90.3+88.6+92.1+88.9+90.8( 简算)
答案:3 悬赏:0 手机版
解决时间 2021-02-23 21:36
- 提问者网友：轮囘Li巡影
- 2021-02-23 11:38
89.1+90.3+88.6+92.1+88.9+90.8( 简算)
最佳答案
- 五星知识达人网友：青灯有味
- 2021-02-23 12:58
解：
89.1+90.3+88.6+92.1+88.9+90.8
=(90-0.9)+(90+0.3)+(90-1.4)+(90+2.1)+(90-1.1)+(90+0.8)
=90×6-0.9+0.3-1.4+2.1-1.1+0.8
=540-(0.9-0.3+1.4)+(2.1-1.1)+0.8
=540-2+1+0.8
=540-1+0.8
=540-0.2
=539.8
89.1+90.3+88.6+92.1+88.9+90.8
=(90-0.9)+(90+0.3)+(90-1.4)+(90+2.1)+(90-1.1)+(90+0.8)
=90×6-0.9+0.3-1.4+2.1-1.1+0.8
=540-(0.9-0.3+1.4)+(2.1-1.1)+0.8
=540-2+1+0.8
=540-1+0.8
=540-0.2
=539.8
全部回答
- 1楼网友：不想翻身的咸鱼
- 2021-02-23 15:12
跟90比
-0.9+0.3+（-1.4）+2.1+（-1.1）+0.8=-0.2
所以为90+（-0.2）=89.8
-0.9+0.3+（-1.4）+2.1+（-1.1）+0.8=-0.2
所以为90+（-0.2）=89.8
- 2楼网友：等灯
- 2021-02-23 13:46
89.1+90.3+88.6+92.1+88.9+90.8
=90-0.9+90+0.3+90-1.4+90+2.1+90-1.1+90+0.8
=90×6-0.9+0.3-1.4+2.1-1.1+0.8
=540-0.2
=539.8
=90-0.9+90+0.3+90-1.4+90+2.1+90-1.1+90+0.8
=90×6-0.9+0.3-1.4+2.1-1.1+0.8
=540-0.2
=539.8
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