1. Fill in the blanks 1, 3456 cubic centimeters = (34.56) liters 6.6 hours = (6) hours (36 minutes) 2. Honghongjia needs to plant several saplings, and the survival rate of saplings is generally 75%-80%. If 1000 saplings are to be planted alive, at least (1000 saplings should be planted. According to the information of the Ministry of Information Industry, by 2008 1 month, the total number of mobile phone users in China had reached 555.769 million, pronounced as (555.769 million), and the mantissa after "10,000" was rounded to (555.77 million). The decimal unit of 4, 3 and 4/9 is (1/9), and the unit of (5) is the smallest composite number. There are 3 tons of coal in the canteen, burning 3/7 tons every day on average, which can last for (7) days. 6. Cut the 3-meter-long rope into 7 sections on average, with the fifth section accounting for (1/7) of the total length and (3/7) meters long. 7. The ratio of1and 3/7: 3/ 14 is (20/3), and the ratio of 4: 9.8 to the simplest integer is (20): (49). 8. The bottom diameter is 16M and the height is 2M. Now, the bottom and sides should be covered with tiles, with an area of (264.96) square meters. If water is injected into it, the water surface is 2m away from the edge of the pool, and the water volume is (40 19.2) m3. 9. A machine part with a length of 5 mm and a length of 2 cm is drawn on the design drawing. The scale of this picture is (4: 1). 10, Xiaodong, Xiaoming and Xiaojun practice playing table tennis at the same table. They took turns playing for an hour, with an average of 40 minutes each. 1 1, 3 ÷ 8 =15: (40) = (37.5)% = (3.75) fold 13, 8 pigeons flew back to three dovecotes, and at least (3) pigeons flew into the same loft. 14. A square piece of silk cloth can be made into a small handkerchief with a side length of 18 cm or a generous handkerchief with a side length of 27 cm, and there is no redundancy. The side length of this square silk is at least 54 cm. 15, the degree ratio of three internal angles of a triangle is 1: 1: 2, and this triangle is an isosceles right triangle. 16. Among the four numbers 1/7, 0. 142, 14.3%, 0.11,the largest number is (1. 17, Xiaogang white rabbit and black rabbit *** 184, white rabbit is more than 4/5 of black rabbit, Xiaogang white rabbit (84). 18, someone's ID number is 612323199807190094, and this person's date of birth is (1998 July 19). He is a (male). Second, choose 1, a bottle of oil 4/5 kg, first pour out its 1/5, and then add 1/5 kg to the bottle. There is more oil in the bottle now than before (A). A, increase B, decrease C, unchanged. 2.(D) the shape is stable. A, a square b, a rectangle c, a trapezoid d, a triangle 3 and a cone all have a certain volume, and their bottom area and height (b). A, proportional to B, inversely proportional to C, disproportional to D, and uncertain to 5. The proportion of girls and boys participating in a math contest is 1: 3, and the average score of this contest is 82, of which the average score of boys is 80 and the average score of girls is (d). A. 82 points, B. 86 points, C. 87 points, D. 88 points and 6 points. Throw coins three times, two heads up, 1 tails up, then the possibility of throwing the fourth coin upside down is (b) a.1/4b.1/2c.2/3d.1/38, and there are 8 chickens and rabbits. When the rabbit has (a) A, 3 B, 4 C and 5 D, it is uncertain how many 9 s, m and n are nonzero natural numbers, and M ÷ n = 1... 1, then the greatest common factor of m and n is (a). A. 1 B. mn C. m D. n 10, there are 13 ping-pong balls, of which 12 have the same weight, and the other one is lighter. If weighed with a balance, it is guaranteed to be found at least (c) times. A. 1 B. 2 C. 3 D. 4 Third, judge 1. In 8.2, -4, 0, 6 and -27, there are three negative numbers. (No) 2. Draw a 60 angle on the paper according to the ratio of 1: 10, and the angle on the paper is still 60. There are 1000 red balls and a white ball in the box. Feel out 1 ball at will, it can't be a white ball. (No) 4. Class 1, Grade 6, with 2 people on leave and 48 people on duty. The attendance rate on this day is 96%. (Yes) 5. If 3a = 4b (a ≠ 0, b≠0), then a: b = 3: 4. (no) four. Calculate 1, and directly write the number 822-199 = 623 7 ÷1.4 = 50.18×10 =1.87//kloc. 3.5×128+350× 0.72 54.2-2/9+4.8-1and 7/9 0.7 ÷ [(5/6-1/4) × 24] = 3.5 * (. Find the value of the unknown quantity X (1) 4.8 ÷120% x = 40 (2) 6/7x+4.8 = 5 Solution: 1.2X=0. 12 Solution: 6/7x = Formula calculation. What is the quotient of the difference between (1) 125 and its 4/5 divided by 0.6? (125-125 * 4/5)/0.6 = 41.66 ... ≈ 42 (2) 65438+0/4 of a number is greater than 2.8, so find this number. Solution: Let this number be X.1/4x-2.8 =1.2x =16.