奥数题19.9+19.98+19.997+19.9996
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奥数题19.9+19.98+19.997+19.9996奥数题19.9+19.98+19.997+19.9996奥数题19.9+19.98+19.997+19.999620-0.1+20-0.02+2
奥数题19.9+19.98+19.997+19.9996
奥数题19.9+19.98+19.997+19.9996
奥数题19.9+19.98+19.997+19.9996
20-0.1+20-0.02+20-0.003+20-0.0004
=20x4-0.1234
=79.8766
19.9+19.98+19.997+19.9996
=(20-0.1)+(20-0.02)+(20-0.003)+(20-0.0006)
=(20+20+20+20)-(0.1+0.02+0.003+0.0004
=80-0.1234
=79.8766
奥数题19.9+19.98+19.997+19.9996
19.9+19.98+19.997+19.996 巧算
19.9+19.98+19.997+19.9996怎么用简便计算
简便运算要简便运算99乘4乘47 （1000减100减10）除10 19.9加19.98加19.997加19.9996
19.9+19.9x99 简算
19.9+19.9*99
199.9×19.98-19.98×1.987 简算
199.9*19.98-199.8*19.97
200.2*20.01-200.1*19.9
12.459*19.9等于多少
计算 199.8+19.98+1.998+2.222
99.9^2+19.98+1/100
简算：19.9＋19.9×99 12.5×0.25×32
19.9+19.9*99用简便计算怎么做
19.9×101×19.9用简便方法怎么做
1.9+19.9+199.9+1999.9简算
46.3-19.9怎么简算
1.9+19.9+199.9+0.3解算