Respostas

2013-12-04T09:05:01-02:00
A1 = 0
r = 9
an = 198
n = ...
an = a1+(n-1).r
198 = 0+(n-1).9
198 = 9n-9
9n = 198+9
9n = 207
n = 207/9
n = 23

12 até 200
a1 = 0
r = 12
an = 192
n = ...
an = a1+(n-1).r
192 = 0+(n-1).12
192 = 12n-12
12n = 192+12
12n = 204
n = 204/12
n = 17

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2013-12-04T10:44:39-02:00
multiplos de 9 ate 200 ? e os de 12 ate 200 tb .
Multiplos de 9 até 200= { 9, 18, 27,36,45,54,63, 81,90 ,99,108,117,126,135,144,153,162,171, 180,189}

12 ate 200 ={ 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180,192 }


1 5 1