(Shanghai Education Press) If you have a specific answer, I would be very grateful

(Shanghai Education Press) If you have a specific answer, I would be very grateful

1 three quarters = (3) divided by (4) = (3): (4) = (75)% 2 1.2 hours: 48 minutes = (3): (2) 3 the area of a city is 15 square kilometers, of which the green area is 2500000 square meters. The ratio of green area to urban area is__ 1：5_ The relationship between the side length and the circumference of a square

Who has the summer vacation of grade six in 2013 (Shanghai Education Press)
P59's art stack, p61's colorful camp, all the answers at the end of p65
As long as p75's "understanding temperature change" 1 and p95's "Shanghai Museum"

P95: my research topic: bronze, ceramics, painting, famous works at all times and in all over the world, development history. What I want to know before visiting: Jade Museum, bronze Museum, ceramics museum, painting Museum, focusing on the special lighting display in jade Museum, prehistoric and three generations later jade treasures; Shang and Zhou dynasties in bronze Museum

Application of trapezoidal area
If a trapezoid is shortened by 3cm, its area will be reduced by 6cm and become a square. What is the area of the original trapezoid?

Suppose: the top and bottom of the original trapezoid is x cm, so the height of the original trapezoid is x cm, and the original trapezoid is right angle trapezoid
The solution of 3x / 2 = 6 is x = 4
So the bottom of the original trapezoid is 7
The area of the original trapezoid is (4 + 7) * 4 / 2 = 22 square centimeters