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killua_98
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
a,tim cac gia tri cua m de phuong trinh sau co 2 nghiem phan biet deu lon hon m:
x^2+x+m=0
b, tim cac gia tri cua a de pt co 2 nghiem phan biet : 4xtuyetdoi(x) +(a-7)x+1=0
c, $\sqrt{7x^2+8x+10}-\sqrt{x^2-8x+10}=2$
x^2+x+m=0
b, tim cac gia tri cua a de pt co 2 nghiem phan biet : 4xtuyetdoi(x) +(a-7)x+1=0
c, $\sqrt{7x^2+8x+10}-\sqrt{x^2-8x+10}=2$
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