《2025年快乐过暑假江苏凤凰科学技术出版社八年级提优版》

4. 若$a^{2}+2ab= 20$,$b^{2}+2ab= 4$,则$\sqrt {a^{2}-b^{2}}$的平方根为$\pm 2$。

答案： $\pm 2$

5. 若$|x-5|+(y+\frac {1}{5})^{2}+\sqrt {z-1}= 0$,则$\sqrt [3]{xyz}=$$-1$。

答案： $-1$

6. 已知$m= 2025^{2}+2024^{2}$,则$\sqrt {2m-1}$的值为______4049。

答案： 4049

7. 已知正数$a的两个平方根x$、$y为方程4x-3y= 28$的一组解,求$a$的值。

答案： $a$ 的值为 16.

8. 已知$\sqrt {2x+10}+|y-2|= 0$,且$\sqrt [3]{1-2z}与\sqrt [3]{3z-5}$互为相反数。
(1)求$y-x$的平方根；
(2)若$3z+2y的算术平方根为A$,$5x-y的立方根为B$,求$A+B$。

答案：
(1)$y - x$ 的平方根为 $\pm \sqrt{7}$.
(2)$A + B = 1$.

1. I failed to save enough money for a new bike last month.
2. There is little time left. We must hurry up.
3. How thick the snow is! Why not make a snowman?
4. Let's stop to rest for a while.
5. It's a shame that you made so many mistakes in the exercises.

答案： 1. save 2. left 3. thick 4. for a while 5. shame

二 阅读短文,从短文后A至F六个选项中选出五个可以填入空白处的最佳选项
Once upon a time, all the animals were called to an early meeting. As they gathered in the public square, one of them, the chicken, was seen by her neighbours going in the opposite
direction. "Hey, Chicken! 1B" they asked. "Didn't you receive the invitation?"
"Yes, I did," replied the chicken. "2CThe thing is, I have some very important personal business that I must deal with. Now, please excuse me. 3APlease tell everyone at the meeting how sorry I am. Tell them that although I won't be there in body, I will certainly be there in spirit! Whatever you decide, you can count on my complete support. Bye!"
The topic the animals would discuss was what to do with the order of the lion. The lion ordered them to give him something to eat.
4DThen they decided that they would offer the lion just one animal. All they asked in exchange was that the lion left the other animals in peace. 5EThey chose the chicken.
1. ____ 2. ____ 3. ____ 4. ____ 5. ____
A.I really must go home.
B.Why are you going away from the square?
C.And I would of course come to the meeting.
D.They had a lively but surprisingly short discussion.
E.The decision about which animal to offer was reached without any disagreement.
F.I won't come to the meeting because I didn't receive the invitation.

答案： 1~5 BCADE