A) P( X) = +X21X1+ = X 2 – 2X + 2000 + = 1 1223-232+ = X = 2 222322-3...
Bài 1 : a) P( x) =
+
x
21
= x 2 – 2x + 2000
+ = 1 12
3
-
+ = x = 2 2 b) x =
+
(
)
3 2 2 - 3 2 2
12
17
- +
x = 3 2 2 + - 3 2 2 - = (1 + 2)
2- ( 2 1) -
2 x = ( 1 + 2 ) – ( 2 - 1 ) = 2
P(2) = 2000
b) x =
+
(
)
3 2 2 - 3 2 2
12
17
- +
x = 3 2 2 + - 3 2 2 - = (1 + 2)
2- ( 2 1) -
2x = ( 1 + 2 ) – ( 2 - 1 ) = 2
P(2) = 2000
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