The fifth grade math book, volume one, page 87. Exercise 191 * * *, with five questions, which is the first question of 12345. Just to find a bottom for you, six centimeters high and 2.5 centimeters. Area. The second problem is to find the area of three parallelograms, the first parallelogram. The bottom is four centimeters and the height is three centimeters. The second parallelogram has a base of 5.2 cm and a height of 3.6 cm. The third parallelogram is. Oh, there are two in Gaoyou, which are 2 cm and 3 cm higher than each other, 2.4 cm and 1.6 cm respectively. The third problem is to calculate the base and height of parallelogram and fill in the space of every four parallelograms. The first bottom is 38 cm high, 2 1 cm, the second bottom is 70 cm high, 15 cm, and the third bottom is 6.2 cm high. 26 cm, the fourth is 2 1.5 cm, the height is 9.8 cm, and the fifth is. Bottom 18 cm, height 5.2cm. The sixth height is 0.9. Cm, 0.9 cm at the bottom. The fourth question is to let you find a way to find the area of the left and right quadrangles. You need to measure its base and height to find the area of the first parallelogram. The base is 2. 1 cm, the height is 1.8 cm, the base of the second parallelogram is 2.4 cm, and the height is1.4cm.. The fifth problem is a parallelogram wheat field. Its bottom height is 250 cm, it is 24 cm, and its harvest is 14.7 tons. How many hectares is this wheat field? Another question is, how many tons of wheat are harvested on average per hectare? You answer the first question first. Write the formula s=AH=6×2 point 5= 15 to answer the second question. First of all, you multiply his ass by his height by four centimeters, which is equal to 12 square centimeter. Second, you multiply his bottom 5.2 cm by his height 3.6 cm. Equal to 18. 12 cm2. You can use the third question. The bottom second floor is multiplied by its corresponding height of 2.4. There is also a set of cardinal numbers and heights. You multiply the bottom of the second group by the height of 1.6 cm, which is equal to its area. Next question, their area. The first question is 798 square centimeters, the second question is 1050 square centimeters, the third question is 16 1.2 square centimeters, the fourth question is 2 10.7 square centimeters, the fifth question is 96 square centimeters, and the sixth question is 0360 centimeters. You can do the fourth question for 4s. The second question, you have to write the area formula of parallelogram and so on. S=AH= 1 point 4×2 point 4=3.36 square centimeters, the fifth question, you multiply its base by its height area formula is s = ah, its base is 250 times, its height is 84 meters, using her area formula xnxn equals 250×84+0000 square meters, and he asks you a * *. In the conversion unit, 2 1000 square meters is equal to 2. 1 hectare. Know how many tons of wheat have been harvested in 2. 1 hectare, and then divide the sum of 14.7 by 2. 1, which is equivalent to seven tons. 2. 1 hectare, with an average of seven tons per hectare.