( 1)5/7? The meaning of 8 is ()

5/7? 1/8 means ()

(2) Story books are 3/5 more than science books, and 3/5 is based on ()? 1? Story books are science and technology books (), and the relationship is ()

(3) April saved 1/7 more than May, and 1/7 regarded () as a unit? 1? April is May's (), and the equivalence relation is ().

(4) A barrel of oil weighs 7/4 kg, and 1/6 kg is poured out, leaving () kg. Column type ().

A barrel of oil weighs 7/4 kg. Pour out 1/6, and there is () kg left. Column type ()

(5) known a? 7/3= 1 1/ 12? b = 1 1/ 1 1？ C, and a, b and c are not equal to 0. Arrange the numbers A, B and C from small to large according to ().

(6) a pile of goods, the first time away half of the total, the second time away half of the first time, this pile of goods left () not out.

(6) 1/7 After the people in class 5/kloc-0 are transferred to class 52, the number of people in class 52 is equal. The original number of class 52 was 5 1 class () ().

(7) For a section of road, 2/5 of the total length is repaired in the first week, 2/5 in the second week and 2/5 in the second week.

(8) To produce a batch of parts, 3/8 of the total number will be completed in the morning, the remaining 2/5 in the afternoon and () in the afternoon.

Second, draw the unit in the question with a horizontal line? 1? Quantity, and then complete the relationship.

(1) There are more hens than roosters 1/4.

( )? 1/4=( )

( )? ( 1+ 1/4)=( )

( )? ( 1+ 1+ 1/4)=( )

(2) The current price of color TV is lower than the original price 1/7.

( )? 1/7=( ) ( )? ( 1+ 1/7)=( )

( )? ( 1+ 1+ 1/7)=( )

Third, choose. (14)

1. The radius of the circle times? Is equal to this circle ().

(1) Half circumference (3) Half circle circumference

2. Draw the largest circle in a rectangle with a length of 6 cm and a width of 4 cm. The area of this circle is _ _ _ _ _ _ _ square centimeter ().

( 1)28.26 (2) 19.625 (3) 12.56

( )

(1) Radius of circle (2) Diameter of circle (3) Area of circle

4. The radius of a circle is 1 decimeter, and the circumference of its semi-circle is _ _ _ _ _ cm. ( )

( 1)3. 14 (2)4. 14 (3)5. 14

5. If the diameter of a circle is enlarged by 6 times, its area will be ().

(1) is enlarged by 6 times, (2) by 36 times and (3) by 12 times.

6. Compared with the shaded area in the following three pictures, the area of _ _ _ _ _ _ is larger. ( )

(1) Picture (1) Big (2) Picture (2) Big (3) Picture (3) Big (4) Same size.

7. As shown in the figure, it is known that the square area is 16 square decimeter, and the area of the circle in the figure is _ _ _ _ _ square decimeter. ( )

( 1) 12.56 (2)6.28 (3)50.24