HOC24
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Giải phương trình: \(3x^2\)+11+\(\sqrt{x-2}\)+\(\sqrt{2x-3}\) = 14x
Cho \(P_x\) = \(\left(3x+\dfrac{5}{2}\right)^3\) - \(\left(x-\dfrac{3}{2}\right)^3\) -\(\left(x+2-m\right)^3\)
và dạng thu gọn: \(P_x\) = \(ax^3\)+\(bx^2\)+cx+d
Tìm m để: a+c = b+d
Cho x, y thỏa mãn: \(\left\{{}\begin{matrix}6x^2-y^2+xy-6y-12x=0\\4x^2-xy+9=0\end{matrix}\right.\)
Tính A = \(\left(8-7x+2y\right)^{2012}\)
Cho a, b, c là các số dương thỏa mãn điều kiện:
a+b+c+ab+bc+ca = 6
Chứng minh rằng:
\(\dfrac{a^3}{b}\)+\(\dfrac{b^3}{c}\)+\(\dfrac{c^3}{a}\)\(\ge\)\(a^2\)+\(b^2\)+\(c^2\)\(\ge\) 3
Tìm số nguyên x, y thỏa mãn:
\(x^2\)+4x+1 = \(y^4\)
D
5.
a. much
b. fits
b. I'm interested in English and History.
c. Nam is good at singing.
e. Why don't we go to the zoo and have some fun ?
f. They are doing their homework and listening to music at the same time.
g. Hoa is the tallest student in the class.
VI.
3. Nam lives with his parents at 24 Tran Hung Dao street.
4. There is a small yard ... his house.
5. There are 5 people in ... family.
VII.
1. is on your pen
2. a lot of vegetables and cattles on my farm
3. has everything
4. is on the right of the market
5. is Lan's older brother
6. to school by bike every day
7. more expensive than the red bicycle
V.
1. Who does Lan live with ?
2. How far is it from your house to the post office ?
3. Where do the doctors work ?
4. What does his father do ?
6. Where do the doctors work ?
7. Where will he meet you ?
8. When does he often feel nervous ?
10. Where will you go tomorrow evening ?
1. Trung is a good student in class 7A.
2. He is older than me.