12(n x n) + 456n - 3468 = 7752
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2006-10-15 1:57 am
回答 (3)
2006-10-15 2:01 am
✔ 最佳答案
12(n x n) + 456n - 3468 = 775212 n^2 + 456n - 11220 = 0
12(n^2 + 38n - 935) = 0
n^2 + 38n - 935 = 0
(n + 55)(n - 17) = 0
n = -55 or 17
2006-10-15 2:06 am
12(n x n) + 456n - 3468 = 7752
12n^2 +456n - 3468 -7752 = 0
12n^2 + 456n -11220 = 0
12(n^2 + 38n - 935) = 0
n^2 + 38n - 935 = 0
(n+55)(n-17) = 0
n = -55 or n = 17
12n^2 +456n - 3468 -7752 = 0
12n^2 + 456n -11220 = 0
12(n^2 + 38n - 935) = 0
n^2 + 38n - 935 = 0
(n+55)(n-17) = 0
n = -55 or n = 17
2006-10-15 2:02 am
12(n x n) + 456n - 3468 = 7752
12n^2+456n-11220=0
(x-17)(x+55)=0
x=17 or x=-55
12n^2+456n-11220=0
(x-17)(x+55)=0
x=17 or x=-55
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