Đáp án:
Giải thích các bước giải:
bài 2 :giải pt:
a, 4x-3/x-5=29/3
<=>3.(4x-3)=29.(x-5)
<=>12x-9=29x-145
<=>12x-9-29x+145=0
<=>-17x+136=0
<=>-17x=-136
<=>x=8
b, 2x-1/5-3x=2
<=>2.(5-3x)=2x-1
<=>10-6x=2x-1
<=>10-6x-2x+1=0
<=>-8x+11=0
<=>-8x=-11
<=>x=11/8
c, 2x+5/2x - x/x+5=0
<=>2x+5/2x=x/x+5
<=>(2x+5).(x+5)=x.2x
<=>2x^2+15x+25-2x^2=0
<=>15x+25=0
<=>15x=-25
<=>x=-5/3
d, 9/x+1 + 2/x-4 =11/x
<=>9x.(x-4)+2x.(x+1)/x.(x+1).(x-4)=11.(x+1).(x-4)/x.(x+1).(x-4)
<=>9x^2-36x+2x^2+2x=11x^2-33x-44
<=>9x^2-36x+2x^2+2x-11x^2+33x+44=0
<=>44-x=0
<=>x=44
e, x+1/x-1 + x-1/x+1=16/x^2-1
<=>(x+1).(x+1)+(x-1).(x-1)/(x+1).(x-1)=16/(x+1).(x-1)
<=>x^2+2x+1+x^2-2x+1=16
<=>2x^2+2=16
<=>2x^2=14
<=>x^2=7
<=> x=√7