Fill in the blanks 1. A number consists of five 1 and three 1/5. This number is () and its reciprocal is ().
Answer: 5 3/5; 5/28
The decimal unit of 2, 2 and 5/8 is (), and then add the decimal unit like () to get the smallest composite number.
Answer:1/8; 1 1
3. The prime factor of decomposition 126 is ().
Answer: 126=2×3×3×7.
It takes 12 minutes to cut a square wood into 4 sections. According to this calculation, it will take () minutes if it is sawed into 8 sections.
Answer: 28
5. A composite number has at least () factors.
Answer: 3
Multiple choice question 1, cut a wire into two sections, the first section is 3/5 meters long, and the second section accounts for 3/5 of the total length, then ().
A, the second section is longer than the first section by b, the first section is longer than the second section by c, and the two sections are as long as d. I'm not sure which section is longer.
A: A.
2. The symmetry axis of isosceles trapezoid is ().
A, 1 b, 2 c, 3 d, countless
A: A.
Number of calculation questions written directly
( 1)0. 125×8-0.99=
(2)7/ 10- 1/5- 1/2=
(3)5.5- 1/5=
(4)7.2+2.8-7.2+2.8=
(5)423- 199=
Answer: (1) 0.01; (2)0; (3)5.3; (4)5.6; (5)224
It is the duty of every citizen to pay taxes according to law. Mr Zhang's total salary last month was 65,438+0, 840 yuan. According to the relevant provisions of the Individual Income Tax Law, Mr. Zhang's salary is more than 65,438+0, 600 yuan, and he is required to pay 5% individual income tax. How much personal income tax should Mr Zhang pay last month?
Answer: 12 yuan
2. For one project, Team A and Team B cooperated for 6 days, and there are still 4/7 projects left. The two teams continue to cooperate. How many days will it take for the remaining projects to be completed?
Answer: 8 days
3. In today's class with 40 students, when testing with questions A and B, 27 students passed the question A, 15 students passed the questions A and B at the same time ... Five students failed the questions A and B ... Assuming that the questions A and B scored 70 points and 30 points, what was the average score of this class?
Answer: 64.5 points
The above are the necessary questions for junior high school entrance, I hope I can help you.