Current location - Training Enrollment Network - Mathematics courses - Kneel for the answer to the seventh grade holiday paradise math problem of Jiangsu Education Edition.
Kneel for the answer to the seventh grade holiday paradise math problem of Jiangsu Education Edition.
As shown in the figure, in a big square with a side length of less than 8cm, put three sheets with an area of 25cm & sup 2;; There are three square pieces of paper, red, yellow and blue. The area of this big square covered by three pieces of paper is 45cm &;; What is the area of this big square?

The covered part is a piece of blue, plus two pieces of red and yellow with the same area (because of the side length of the square, etc.) (45-25)/2= 10, both red and yellow are 10 square centimeter 25=5*5, the side length of three pieces is 5, and the other side of red and yellow is10.