Nhanh len di mn TT
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LN
9 tháng 10 2016
x2 - 15 = 1
x2 = 1 + 15
x2 = 16
=> x = 4
nha bn
mn ủng hộ mik nha
KY
21 tháng 7 2021
refer
As far as the popularity of cars is concerned, there is no denying that going a car brings about considerable benefits. First and foremost, it is an inescapable fact that cars offer a variety of merits. Personal mobility and independence derived from having a car mean people can go anywhere at any time they want without depending on fixed schedules of public transportation systems. There are still many areas where the public transportation system has not developed well yet. Using a car helps people conveniently reach the place they want. Besides, a car has unlimited space for belongings and passengers. Car owners can give a lift to many passengers and bring along as many belongings as they need. Moreover, a car can make its longevity to 200000 miles or more, so we hardly need to buy a new car, or even never. In summary, although owning a car presents a wide array of upsides, people should use cars wisely to optimize advantages.
16 tháng 2 2017
bác tài xế tên là lên người đi năm ( Năm ) ^^ đoán lung tung
\(a,\left\{{}\begin{matrix}x+y=3\\x^2+y^2+xy=2m+1\end{matrix}\right.\)
Thay m = 3 vào hpt trên ta được hệ mới :
\(\left\{{}\begin{matrix}x+y=3\\x^2+y^2+xy=7\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x+y=3\\\left(x+y\right)^2-xy=7\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x+y=3\\9-xy=7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=3-x\\-x\left(3-x\right)+2=0\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}y=3-x\\x^2-3x+2=0\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}y=3-x\\\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x=1\\y=2\end{matrix}\right.\\\left\{{}\begin{matrix}x=2\\y=1\end{matrix}\right.\end{matrix}\right.\)
Vậy \(S=\left\{\left(1;2\right);\left(2;1\right)\right\}\) khi \(m=3\)
khg để ý bn này lắm , nma biết lên hạng nè :v Chúc mừng lên hạng nhá :vvv