⑵ Divide the 7-meter-long rope into 5 parts on average, each part is 0/5 of 65438+7 meters, and each part is 7/5 meters.
(3) In 12, 17, 26 and 34, 17 is a factor of 34, and 12 and 17 are prime numbers.
(4) The decimal units of1and 3/5 are 1/5, and two such decimal units are the smallest prime numbers.
5] 1.25 hours =5/4 hours (fill in the score).
The sum of the largest decimal unit and 7 1 is 9/ 14.
(7) Of the 50 parts of17, 0.64, 2/3 and 6/25, the smallest number is 6/26, and the two equal numbers are not.
The sum of the simplest true fractions whose denominator is 10 is 2.
A cuboid is divided into two cubes on average, and the side length of the cube is 4cm, so the surface area of this cuboid is 5/3 times that of the cube.
⑽a÷3=b, (both a and b are non-zero integers), the greatest common factor of a and b is b, and the smallest common multiple is a.
2. True or false
(1) The greatest common factor of five consecutive natural numbers is 1. correct
(2) 3/4 kg can represent either 3/4 of 1 kg or 3 kg of 1. That's right.
(3) 57 out of 76 are the simplest scores. wrong
(4) Divide the unit "1" into several parts, and the number representing such one or several parts is called a fraction. wrong
5] The false scores of molecule 3 are only 65438+3/0 and 3/2. wrong
The larger the score unit, the greater the score. wrong
In a set of data, there may or may not be multiple patterns. correct
Make a cube with a length of 10 cm and divide it into two cuboids, and the surface area will be increased by 200 cm 2. correct
3. Application questions
What is the quotient of the difference between the minimum composite number and the maximum single digit divided by their product?
(9-4)÷(9×4)=5/36
(2) Subtract 7/9 from 5 times a number to get 2/9. What's this number?
(2/9+7/9)÷5= 1/5
(1) Chen Xinhua spends 3/4 hours painting, more than practicing calligraphy 1 hour. How many hours did it take to practice calligraphy and painting?
3/4+(3/4- 1/6)=4/3 (hour)
⑵ Fill a cube glass jar with 4 decimeters long with water, and then pour all the water into a rectangular jar with a bottom area of 20 square decimeters. How high is the water level in the water tank?
(4×4×4)÷20= 16/5 (decimeter)
4. Practice and innovation
① A fraction is 1 when the molecule adds 1 and 3/4 when the molecule subtracts 2. The score is1112.
②5/8 molecules minus 2. In order to keep the score unchanged, the denominator should be subtracted from 16/5.
③ Calculate 1+6 in 2,1+0 in 2, 1+30 in 65438, 1+42, 1=7/8.