Question

高一😛

求為什麼有負號的答案

199|設皆爲實數,已知ax-b≤2的解爲-1≤x≤7 丰求\(a, b)
-2th - X≤ 2+b
-2+b
a x tb
2+b = 1
a
2+b = 7a
7a-b=2
-2 +b = -1
a
Ja-b=2
+) a+b=2
-2 + b = -a
a+b = 2
sa, 4
A
)
a=3
D = 2
答:(
13
(107 員中)
)或(23
22

絕對值不等式