2. If a cuboid with a length of 6 cm, a width of 4 cm and a height of 4.5 cm is cut into two cuboids, the maximum surface area will increase by (48) cm2, and the minimum surface area will increase by (36) cm2.

3. The side length ratio of two cubes is 4 ∶ 3; The surface area ratio of large and small cubes is (16: 9); The volume ratio of large and small cubes is (64; 27 )。

4,56 is (? ) 38, (? ) 45 tons is 34 tons.

5. A rope 10 meter long, needs 12, and the remaining (? ) meters, and then use it to 12 meters, leaving (? ) meters.

6. 50 grams of syrup was made from 5 grams of sugar, and the mass ratio of sugar to water was (1:9), and sugar accounted for (10%) of syrup.

7. There are 2 tons of rice in the canteen, which is eaten every day 120, (? ) you can eat it in one day, eating 12 tons a day. ) you can eat it in a few days.

8. 1.4: 3.5 The simplest integer ratio is (2:5) and the ratio is (2/5).

9. The sum of the sides of a cuboid is 80cm, and the ratio of length, width and height is 5: 3: 2. This rectangle is (10) cm in length, (6) cm in width, (4) cm in height and (240) cm in volume.

10, 15 kg More than 25 kg is (40) kg.

1 1. Divide 6-decimeter-long cubic wood into two cuboids, and increase the surface area by (72) square decimeter.

12, the number of boys is 56 of the number of girls, and the number of boys is less than that of girls. ), there are more girls than boys (? )。

13. After putting 17 rice from bag A into bag B, the two bags of rice have the same weight. It turns out that there is more rice in bag A than in bag B (? )

14, 20 ml =( 0.02) liter hectare = (? ) square meters

15. A square piece of paper is one centimeter long. Fold it into two identical rectangles. The circumference of each rectangle is (3A) cm and the area is (A*A) cm 2.

16, add 200 grams of water and 20 grams of honey to make honey water. After simplification, the mass ratio of honey to water is (1: 10), and the mass ratio of water to honey water is (10:1).

17, Li Shifu processes a batch of parts, and it takes 3 days to process this batch of parts 18, so the number of parts processed every day (? ),( ? ) Half of these parts can be processed in one day.

Second, choose

1. Divide a 3-meter-long cuboid wood into three sections on average, and increase the surface area by 2.4 square meters. The volume of this wood is cubic meters.

a、 1.2 B、 1.8 C、2.4

2. Divide a rope into two sections, the first section is 27m, and the second section is 27m. Compare two pieces of rope (c).

A, the first section length b and the second section length c are not comparable.

3. Science and technology books 100, how many science and technology and literature and art books are there? If the number of * * * in the two volumes is100 ÷14+100, the horizontal line should be filled in (c).

A, 14 B is more than literary books, 14 C is less than literary books, 14 D is scientific books, and 14 is literary books.

If the number of A is six times that of B, then the following statement (b) is correct.

A, A number is the sum of A and B 17 B, and the ratio of B number to the sum of A and B is 6: 7.

The ratio of c, a and b is 1: 6 d, and b is 16 of a.

5. It is known that A and B are reciprocal, and a2 ÷ 2b =? ( ? )

a、 14 B、 1 C、4

6. On the clock face, the ratio of the rotation speed of the hour hand to the rotation speed of the minute hand is (A)

a、 1∶ 12 B、 1∶60 C、 12∶ 1

7. The ratio of the degree of the top angle and the bottom angle of an isosceles triangle is 3:1. What triangle is this triangle? (1)

A, obtuse triangle b, right triangle c, acute triangle

8,38× yx > 38, then (b)

a、X>Y B、X