Bài 1 Xét dấu biểu thức sau
1 , fleft(xright)2x^2-x+1
2 , fleft(xright)-2x^2+5x+7
3 , fleft(xright)9x^2-12x+4
4 , fleft(xright)2x^2+2x+5
5 , fleft(xright)2x^2+2sqrt{2}x+1
6 , fleft(xright)-4x^2-4x+1
7 , fleft(xright)sqrt{3}x+left(sqrt{3}+1right)x+1
8 , fleft(xright)x^2+left(sqrt{5}-1right)x-sqrt{5}
9 , fleft(xright)x^2-left(sqrt{7}-1right)+sqrt{3}
10 , fleft(xright)left(1-sqrt{2}right)x^2-2x+1+sqrt{2}
Đọc tiếp
Bài 1 Xét dấu biểu thức sau
1 , \(f\left(x\right)=2x^2-x+1\)
2 , \(f\left(x\right)=-2x^2+5x+7\)
3 , \(f\left(x\right)=9x^2-12x+4\)
4 , \(f\left(x\right)=2x^2+2x+5\)
5 , \(f\left(x\right)=2x^2+2\sqrt{2}x+1\)
6 , \(f\left(x\right)=-4x^2-4x+1\)
7 , \(f\left(x\right)=\sqrt{3}x+\left(\sqrt{3}+1\right)x+1\)
8 , \(f\left(x\right)=x^2+\left(\sqrt{5}-1\right)x-\sqrt{5}\)
9 , \(f\left(x\right)=x^2-\left(\sqrt{7}-1\right)+\sqrt{3}\)
10 , \(f\left(x\right)=\left(1-\sqrt{2}\right)x^2-2x+1+\sqrt{2}\)