49.7+59.7+69.7+.+99.7+109.7简算
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49.7+59.7+69.7+.+99.7+109.7简算
![49.7+59.7+69.7+.+99.7+109.7简算](/uploads/image/z/15324246-54-6.jpg?t=49.7%2B59.7%2B69.7%2B.%2B99.7%2B109.7%E7%AE%80%E7%AE%97)
49.7+59.7+69.7+.+99.7+109.7
=50-0.3+60-0.3+70-0.3+80-0.3+90-0.3+100-0.3+110-0.3
=(50+60+70+80+90+100+110)-0.3×7
=560-2.1
=557.9
=50-0.3+60-0.3+70-0.3+80-0.3+90-0.3+100-0.3+110-0.3
=(50+60+70+80+90+100+110)-0.3×7
=560-2.1
=557.9
简算100+99.9-99.8-99.7+···+0.4+0.3-0.2-0.1
简算9.7+99.7+999.7+9999.7+99999.7谢谢了,大神帮忙啊
69.7*101-69.7和88.8*99+88.8简便运算
求两组数据的标准偏差A 77.6 68.9 69.7 66.2 69.7 68.0 B 109.3 115.1 109.
9.7+99.7+999.7+9999.7+99999.7
简算
简算!
简算(简算)
99.9+99.8-99.7=?简便计算
99.7%氧化锌中锌的含量是多少?
氧化锌99.7%和98.5%有什么不同吗
0.7+9.7+99.7+999.7+9999.7+99999.7+999999.7+9999999.7+9999999