It's definitely embarrassing for the child," Dad said angrily!The daughter next to her said, "Pull it down, how can this question be so difficult?"Yesterday I used three different methodsDaddy looked confused when he heard this!
Question: As shown in the figure, the circumference of the green rectangle in the middle is known to be 18, and 4 squares are made outward, if the sum of the areas of the squares is 82, find the area of the middle rectangle.
When I saw this question, my first reaction was to hypothesize:
1.Find the length and width of the green rectangle in the middle 18 2 = 9 (the sum of length and width) assuming that the length is 5 and the width is 4. The sum of length and width is 9;
2.5x5x2+4x4x2=50+32=82 conforms to the question, giving the sum of the areas of 4 squares 82;
3.Green rectangle area = 5 4 = 20.
The answer is to come out, but this method is not convincing for children. Guys, do you have a better way to solve it?Leave a message to share your problem-solving secrets.
The child's Xi grades are not satisfactory, and he wants to apply for a training class, but he doesn't know which training institution is reliable
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