9999999999²
= (10000000000 - 1)²
= 10000000000² - 2*10000000000 + 1
= 10000000000 0000000000 - 20000000000 + 1
= (9999999999 0000000000 + 10000000000)- 20000000000 + 1
= (9999999998 0000000000 + 20000000000)- 20000000000 + 1
= 9999999998 0000000000 + 1
= 99999999980000000001
或按照规律
9*9 = 81
99*99 = 9801
999*999 = 998001
推得9999999999的平方 = 9个9,1个8,9个0,1个1
因此共有9+1 = 10个奇数数字
9999999999的平方中有多少个奇数数字.
9999999999的平方中有多少个奇数数字.
急,做不来,
求求你们了
急,做不来,
求求你们了
数学人气:903 ℃时间:2020-02-04 00:21:04
优质解答
我来回答
类似推荐
猜你喜欢
- 1历练后的飞翔
- 2带有1,2,3,4,5,6,7,8,9,10,千,百的成语
- 3"you will always know what you want and where you
- 4Do somereading ,piease改为否定句
- 5英语翻译
- 6在试管中装水,用软木塞住,加热使水沸腾,水蒸气把软木塞冲出.塞被推出前,试管中水蒸气温度()100摄氏度.
- 7my father has lived here since 2000变为一般疑问句_ _ _your father_
- 8将浓度为2mol/L的AgNo3 Cu(No3)2 各0.5L混合以后,用铜电极电解一段时间后,阴极上有1.6gCu析出
- 9There is a little sheep on the hill?分不清
- 10如图是弧长为8πcm扇形,如果将OA,OB重合围成一个圆锥,那么圆锥底面的半径是_cm.