Giải các bất phương trình :
1)34x23x+12<(13)40x22)(17)9x28x+13<77x2
1)
TXĐ: R.
Chọn cơ số chung là 3 khi đó BPT đã cho tương đương
34x23x+12<340x2
4x23x+12<40x2 (do hàm số y=3t đồng biến trên R)         
72x2+6x1>0
(12x1)(6x+1)>0
[x<16x>112.
Vậy BPT đã cho có nghiệm  [x<16x>112

2)
TXĐ: R.
Chọn cơ số chung là 7 khi đó BPT đã cho tương đương
79x2+8x13<77x2
9x2+8x13<7x2 (do hàm số y=7t đồng biến trên R)   
16x2+8x13<0
(4x+3)(4x1)<0
34<x<14
Vậy BPT đã cho có nghiệm:
34<x<14

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