巧算（简便运算）
答案:2 悬赏:0 手机版
解决时间 2021-03-08 12:31
- 提问者网友：椧運幽默
- 2021-03-07 22:53
巧算（简便运算）
最佳答案
- 五星知识达人网友：十鸦
- 2021-03-07 23:16
1. 199.7+997.7+977.1-1997.71
=200-0.3+1000-2.3+1000-22.9-2000+2.29
=200-2.6-22.9+2.29
=200-22.9-0.41
=200-22-1.31
=178-1.31
=176.69
2. 7.2 ×61.3 + 73.8×2.8
=7×61.3+0.2×61.3+73.8×(3-0.2)
=429.1+12.26+221.4-14.76
=429.1+221.4+12.26-14.76
=650.5-2.5
=648
=200-0.3+1000-2.3+1000-22.9-2000+2.29
=200-2.6-22.9+2.29
=200-22.9-0.41
=200-22-1.31
=178-1.31
=176.69
2. 7.2 ×61.3 + 73.8×2.8
=7×61.3+0.2×61.3+73.8×(3-0.2)
=429.1+12.26+221.4-14.76
=429.1+221.4+12.26-14.76
=650.5-2.5
=648
全部回答
- 1楼网友：毛毛
- 2021-03-07 23:25
7.2 ×61.3 + 73.8×2.8
=7×61.3+0.2×61.3+73.8×(3-0.2)
=429.1+12.26+221.4-14.76
=429.1+221.4+12.26-14.76
=650.5-2.5
=648
=7×61.3+0.2×61.3+73.8×(3-0.2)
=429.1+12.26+221.4-14.76
=429.1+221.4+12.26-14.76
=650.5-2.5
=648
我要举报
如以上问答信息为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！
大家都在看
推荐资讯