2,-4,8,-16,32,-64.(1) 4,-2,10,-14,34,-62.(2) 1,-2,4 ,-8,16,-
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2,-4,8,-16,32,-64.(1) 4,-2,10,-14,34,-62.(2) 1,-2,4 ,-8,16,-32.
2,-4,8,-16,32,-64.(1)
4,-2,10,-14,34,-62.(2)
1,-2,4 ,-8,16,-32.(3)
1),第(1)行第8个数为( ),第2行第8个数为( ),第3行第8个数为( ) ;
2),第(3)行中是否存在连续的三个数,使得三个数的和为768,若存在求出这三个数,不存在说明理由;
3),是否存在这样的一列,使得其中的三个数的和为1282,若存在求出这三个数,不存在说明理由.
2,-4,8,-16,32,-64.(1)
4,-2,10,-14,34,-62.(2)
1,-2,4 ,-8,16,-32.(3)
1),第(1)行第8个数为( ),第2行第8个数为( ),第3行第8个数为( ) ;
2),第(3)行中是否存在连续的三个数,使得三个数的和为768,若存在求出这三个数,不存在说明理由;
3),是否存在这样的一列,使得其中的三个数的和为1282,若存在求出这三个数,不存在说明理由.
1) -256 -254(规律后面一个数=它的前面的第二个数*2-它前面的第一个数比如10=4*2+2) -128
2)设有这样的三个数a,-2a,4a a-2a+4a=3a=768 得a=256 存在第9个数为256
3)?
2)设有这样的三个数a,-2a,4a a-2a+4a=3a=768 得a=256 存在第9个数为256
3)?
2,-4,8,-16,32,-64.(1) 4,-2,10,-14,34,-62.(2) 1,-2,4 ,-8,16,-
观察下面三行数 (1),2,-4,8,-16,32,-64.(2) 4,-2,10,-14,34,-62...(3)1,
2,-4,8,-16,32,-64.① 4,-2,10,-14,34,-62.② 1,-2,4,-8,16,-32.③看
4,-2,10,-14,34,-62...; 1,-2,4,-8,16,-32
2,-4,8,-16,32,-64 4,-2,10,-14,34,-62 1,-2,4,-8,16,-32
观察下面三行数:2,-4,8,-16,32,-64,...;① 4,-2,10,-14,34,-62...;②
1)-2,4,-8,16,-32,64.(2)0,6,-6,18,-30,66.
2,-4,8,-16,32,-64,...; 4,-2,10,-14,34,-62,...; 1,-2,4,-8,16,
1、2、4、8、16、32、64.有什么规律?
下面有三组数 -2,4,-8,16,-32. -4,8,-16,32,-64. -4,2,-10,14,-34..
观察下面三行数:(1)-2,4,-8,16,-32,64.(2)0,6,-6,18,-30,66.
观察下面三行数 -2 4 -8 16 -32 64 -4 2 -10 14 -34 62 +1 -2 +4 -8 +16