1.r = 5 cm2. C=50dm 3。 d=0. 1m

2. Find the circumference of the circle.

1.s=50 cm2.d = 9dm3.r = 8m

3. Application questions.

1. Xiaohong's family raised 1000 geese this year, 20% less than this year and 30% more than last year.

(1) How many geese were raised last year? (2) How many geese were raised the year before last? (3) How many geese have been raised in the past three years?

2. For a certain distance, Team A can finish it in 5 hours and Team B can finish it in 4 hours. If Team A and Team B are built together, how long will it take?

3. In the sixth grade, there are 25% more boys than girls, and what percentage are girls less than boys?

4. Xiaohong's mother deposited 1000 yuan in the bank for Xiaohong for five years, with an annual interest rate of 4. 14% and interest tax of 5%.

(1) How much interest does Xiaohong get?

(2) What is Xiaohong's principal and interest?

No ~ ~ ~ Hehe