Câu7:
x a b c
10 4
4 2 2
x x x x x
a/
3
2 2 2ax a bx bx cx cx
2x x
( 4)
( ) (2 2 ) 4
a b c x c b x a
34
x x
a b c
a
1
0
c b
2 2 10
3
b
4 4
2
c
Nên :
a bx c
( 1)( 1) 1 1
x x x x x x
b/
2 2
2 2ax ax a bx bx cx c
( 1)(
2 1)
x x x
( ) ( )
a b x a b c x a c
( 1)( 1)
a b
a c
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