Sixth grade primary school, 6 manuals of mathematical evaluation, 3 1 page, answers.
1, 5 times 25 times. 2.600.3. The ratio of length, width and perimeter of the rectangle before and after enlargement is 2:3, and the area ratio is 4:9. 4.A: 260×4+9 = 80 (square centimeter) B: 260× 4+9= 180 (square centimeter)