Two numbers whose product is () and 1 are called mutual ().

2, 27/4 contains () 1/4, and its decimal unit is (), and the unit like () is 8.

3. The simplest integer ratio of 2.25:3/2 is (), and its ratio is ().

The ratio of 4.4:4/3 to the simplest integer is (). If the former term of this ratio is expanded by 5 times, the latter term should be () to keep the ratio unchanged.

5. The length of a wire is 15 meters, and after subtracting () meters, there is still the total length of 1/5.

Second, the judgment question. (10)

1, a number of 1/4 is 100, and this number is 1600. ()

2. 5/7 of1kg and 5 kg of 1/7 are equal. ()

3. When two numbers are multiplied, the product is not necessarily greater than the factor. ()

4. The number A divided by the number B is equal to the reciprocal of the number A multiplied by the number B.

5. Boys account for 3/5 of the class, and the ratio of male to female is 3: 5. ()

Third, multiple choice questions. (10)

1, 2/5 and 4/ 10 ()

A means the same; B, the decimal units are the same; C, the size is equal; D, I can't be sure.

2. If the number of boys is more than that of girls 1/7, the number of girls is less than that of boys ()

a、 1 B、 1/7 C、 1/8 D、 1/ 15

3.A's 1/6 and B's 1/4 are equal, and A differs from B by 5, and A is ().

a、 1/4 B、3 C、 15 D、 10

4, complete 3/5 of a project, the rest of the project is completed ()

a、2/3 B、2/5 C、 1/5 D、 1/3

5. The number of A is less than that of B 1/4, and the ratio of A to B is ().

a、3:4 B、4:3 C、 1:4 D、4: 1

Fourth, according to requirements. (40 points)

1, a number written directly. (8 points)

3-8/3= 1/7- 1/8= 5/4×6= (4/5-0.8)×3/7=

0.6+2/5= 2.4×5/8= 49÷49/57= 2×0.5÷0.5×2=

2. Solve the equation: (12 points)

X- 1/4X = 3/8 3.6-2X = 14/5( 1+ 1/2)X = 12 X× 1/2×4/5 = 10

3. Simplification can be simplified: (12 points)

12.72-7.83-2. 17 2/5×6+4×2/5 3.8+5.6÷7×4 1/5÷3/4+4/5×2/3

4. Column calculation: (8 points)

① What is the product of 2/3 plus 1/4 divided by 3/4 quotient and multiplied by 1/4?

② Two thirds of a number is 1/4. What's this number?

Verb (abbreviation of verb) Application problem: (30 points)

1, Wang weighs 30 kilograms, which is 5/6 of his brother's weight. His brother's weight is 1/2 of his father's weight. What is his father's weight?

2. Fruit shops have 108 boxes of apples, which is 3/2 times that of pears, and oranges are 8/9 times that of pears. How many boxes of oranges are there?

The road team built a 20-kilometer-long road. On the first day, 1/20 of the total length was repaired, and on the second day, 3/4 kilometers were repaired. How many kilometers remain to be repaired?

4. Party A and Party B ride bicycles and walk back to back from the same place. Party A travels13km per hour, and Party B travels 1 1 km per hour. A few hours later, they were 82 kilometers apart.

5. A rectangular piece of land with a circumference of 80 kilometers and an aspect ratio of 3: 2. What is the length, width and area of this land?