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Content text B9.2 Rut gon bieu thuc chua can bac hai-GV.pdf




Bồi dưỡng năng lực học môn Toán 9 THỰC HÀNH GIẢI TOÁN LỚP 9 4 2 5 1 3 1 3 1 1. x x A Vậy A 1 khi x 3 5 3 29 12 5 9. a) Ta có 3 2 9 3 9 4 2 : 1 2 3 6 9 2 x x x x x x A x x x x x x x x b) Ta có 3 3 3 2 10 6 3 3 1 3 1 3 1 3 1 3 1 2 6 2 5 5 1 5 5 5 1 5 x Vậy 2 2 2 1 2 A 10. a) Ta có 1 1 1 1 ab a b a b a b ab a b a b a b P a b ab ab ab 1 2 2 P a b a b a b a b a b a b : a b a b b) 2 2 a b 2019 2 2018 2018 1 ; 2019 1 P 2018 1 2019 1 2018 2019 11. a) Điều kiện x y xy 0; 0; 1. 2 : 1 1 1 1 x y x y x y xy P xy xy xy 1 2 : 1 1 1 x x y y y x x x y y y x xy x y xy P xy xy xy 2 2 1 1 2 1 1 1 1 1 1 x y y y x xy xy P xy x y xy xy x y 2 1 y P y

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