Question

tim x biet /x^2+/3x-1//=x^2+7

Answer 1

là đấy

Answer 2

kết quả là2

Answer 3

|x²+|3x-1||=x²+7

Vì |x²+|3x-1|| \(\ge\) 0;

    x²+7 \(\ge\) 0

nên VT=VP

<=>x²+|3x-1|=x²+7

<=>|3x-1|=x²+7-x²=7

<=>\(\int^{3x-1=7\Rightarrow3x=8\Rightarrow x=\frac{8}{3}}_{3x-1=-7\Rightarrow3x=-6\Rightarrow x=-2}\)

Vậy x \(\in\) (-2;8/3}