標題:
中一英文數學
發問:
6,-3,-12,-21... The next two terms are _____,_____. Dertermine what kind of sequence it is? It is ________ sequence.
最佳解答:
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6, -3, -12, -21... The next two terms are - 30, - 39 Determine what kind of sequence it is? It is _arithmetic___ sequence. Comment:2nd term – 1st term = (-3) – (6) = -93rd term – 2nd term = (-12) – (-3) = -94th term – 3rd term = (-21) – (-12) = -9 So the common difference is =-9The first term is 6 The general term of an arithmetic sequence is given by:tn = a + (n – 1) d where a is the first term, n the number of term, and d is the common difference.In the above example, a = 6 and d = -91st term = 62nd term, t2 = 6+(2 -1)(-9) = -33rd term, t3 = 6+(3 -1)(-9) = -124th term, t4 = 6+(4 -1)(-9) = -215th term, t5 = 6+(5 -1)(-9) = -30; It can also be obtained by (-21) + (-9) = -306th term, t6 = 6+(6 -1)(-9) = -39; It can also be obtained by (-30) + (-9) = -30
其他解答:
6,-3,-12,-21... 6 -9 =-3 -9 =-12 -9 =-21 -9 =-30 -9=-39 The next two terms are -30 , -39 . Dertermine(determine ?) what kind of sequence it is? It is big to small (i am not sure) sequence.4E350C6F8B48ECA2
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