HOC24
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Chủ đề / Chương
Bài học
Hãy tìm cặp số (x;y) sao cho y nhỏ nhất thỏa mãn:
\(x^2+5y^2+2y=4xy+3\)
Giải hệ phương trình:
\(\left\{{}\begin{matrix}xy+x+y=19\\x^2y+xy^2=84\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x+y+2=4\left(x+1\right)\left(y+1\right)\\x+y+xy=-\frac{3}{4}\end{matrix}\right.\)
Giải hệ phương trình sau:
\(\left\{{}\begin{matrix}x^2+y^2-xy=1\\x^2+y^2=x+y\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x+y+2xy=7\\x^2+y^2=5\end{matrix}\right.\)
Đặt câu hỏi cho cụm từ gạch chân:
1) Why do you enjoy your hobby?
I enjoy my hobby because I think it's creative
2) How much time a day do you spend on your hobby?
I spend two hours a day on my hobby
3)What does Jim usually do in his free time?
Jim usually plays volleyball in his freetime
4)How often does he play volleyball?
He plays volleyball three times a week
5) Where does he often play volleyball?
He often plays volleyball at the court near his school
Rút gọn biểu thức:
\(A=\frac{1}{\sqrt{x-1}-\sqrt{x}}+\frac{1}{\sqrt{x-1}+\sqrt{x}}+\frac{\sqrt{x^3}-x}{\sqrt{x}-1}\)