Câu 2: Trang 94 - Toán tiếng anh lớp 5:A trapezoidal field with a long base of 120m, the short base...

Substitute the value A = 100h from answer 2 into the equation for total rice produced, we get Total rice produced = 100h $ imes$ (64.5/100) = 0.645h kg. Finally, substitute the value of h into the equation to find the total kilogram of rice produced on the field.

Given that each 100m2 of the field produces 64.5kg of rice, the total amount of rice produced can be calculated by multiplying the total area of the field by the rice produced per 100m2. So, Total rice produced = Area of field $ imes$ (Rice produced per 100m2/100)

The area of a trapezoid is calculated using the formula A = $rac{1}{2}$(a + b)h, where a and b are the lengths of the two bases, and h is the height. Substituting the values we have, A = $rac{1}{2}$(120 + 80)h = 100h

Let the height of the trapezoidal field be h meters. According to the given information, the short base is $rac{2}{3}$ times the long base, so the short base is $rac{2}{3} imes 120 = 80$ meters. Also, the short base is 5 meters longer than the height, so the short base is h + 5 meters.