2. The trapezoidal upper bottom is 4m, 2m shorter than the lower bottom, and the height is as long as the upper bottom. The area of this trapezoid is ().
3. The average length of the upper and lower sides of the trapezoid is 30 cm, and the height is 2 decimeters. The area of this trapezoid is ().
4. The base of a triangle is12m, which is three times as high and covers an area of () hectares.
5, a right-angled trapezoid, if the upper bottom is extended by 5 cm, the area is increased by 25 square cm, which is exactly a square. The original trapezoidal area is () square decimeter.
6. The smallest integer unit is () times the largest decimal unit.
7. Make a rectangle with 1 8cm2 pieces of paper1cm2, without overlapping, so the maximum circumference of the rectangle is () cm, and the minimum circumference is () cm.
8.0.8 A few tenths and a few percent.
9, 4 decimeters, 6 centimeters = () meters, 20 square centimeters = () square decimeters.
0.3 hectares = () square meters 60 hectares = () square kilometers.
10, the three sides of a right triangle are 12cm, 16cm and 20cm respectively, and the area of this triangle is ().
1 1, a three-digit decimal is rounded to 3.4, and the minimum value of this three-digit decimal is ().
12, the area of a parallelogram is 0.2 square meters, the bottom is 6 decimeters and the height is ().
13、5? The business cycle decimal of 9 is expressed as (), the reserved two decimal places are (), and the accuracy to one thousandth is ().
14, a car uses 0.75 liters of gasoline for 6 kilometers, with an average of () liters of gasoline per kilometer, and each liter of gasoline can dry () kilometers.
15, each set of children's clothes is 2.2 meters, and 50 meters of cloth can be used to make () sets of children's clothes. If each set of children's clothes is 38.5 yuan, 650 yuan can buy () sets of children's clothes.
16. Rewrite 483600 into () in units of "ten thousand", and then keep one decimal place as (); Rewrite 196800000 as () with "100 million" as the unit, and then keep two decimal places as ().
17. The bottom of the trapezoid is twice that of the upper bottom, and the upper bottom is extended by 6 cm, forming a parallelogram with an area of 144 cm. The area of this trapezoid is ().
18, Xiao Juan lost the decimal point in the divisor 2.8 1 when calculating a topic, and the result was 1 1.52, so the correct calculation result should be ().
19、0. 125? 0.8 When the quotient reaches the percentile, the quotient is () and the remainder is ().
20. The taxi fare standard in a city is: 8 yuan is charged within 3km, 2.4 yuan is charged for every increase of 1 km over 3km, and fuel surcharge is charged for every ride 1 yuan. Xiaoming takes a taxi 10 km, and he manages (). Xiao Zhang has to pay 28.2 yuan to take a taxi from home to work, and Xiao Zhang's journey to work is about () kilometers.
2 1, Xiao Qiang can only go east and north from home, and there are () different routes to take.