题目列表(包括答案和解析)
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 1 | 3 | 7 | 13 | 21 | 31 | 43 |
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | y1 | y2 | y3 | y4 | y5 | y6 | y7 |
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 10 | 50 | 110 | 190 | 290 | 412 | 550 |
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 1 | 3 | 7 | 13 | 21 | 31 | 43 |
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | y1 | y2 | y3 | y4 | y5 | y6 | y7 |
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 10 | 50 | 110 | 190 | 290 | 412 | 550 |
小明为了通过描点法作出函数的图象,先取自变量x的7个值满足:
x2-x1 = x3-x2 = … = x7-x6 = d,再分别算出对应的y值,列出表1:
表1:
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 1 | 3 | 7 | 13 | 21 | 31 | 43 |
记m1 = y2-y1,m2 = y3-y2,m3 = y4-y3,m4 = y5-y4,…;s1 = m2-m1,s2 = m3-m2,
s3 = m4-m3,…
⑴判断s1、s2、s3之间关系,并说明理由;
⑵若将函数“”改为“”,列出表2:
表2:
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | y1 | y2 | y3 | y4 | y5 | y6 | y7 |
其他条件不变,判断s1、s2、s3之间关系,并说明理由;
⑶小明为了通过描点法作出函数的图象,列出表3:
表3:
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 10 | 50 | 110 | 190 | 290 | 412 | 550 |
由于小明的粗心,表3中有一个y值算错了,请指出算错的y值(直接写答案).
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 1 | 3 | 7 | 13 | 21 | 31 | 43 |
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | y1 | y2 | y3 | y4 | y5 | y6 | y7 |
x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
y | 10 | 50 | 110 | 190 | 290 | 412 | 550 |
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