1, during the Spring Festival, my mother and I bought a catty of pork from 2 yuan and a catty of mutton from 2.5 yuan1.How much is it for 6 yuan's mother to buy a catty of pork and a catty of mutton1catty of beef * *?

2. During the Spring Festival, my grandparents each gave me 100 yuan lucky money, and my mother gave me 50 yuan lucky money. How much did my grandparents and my mother give me?

The five words "Happy Spring Festival" in the following equation represent different numbers. Please replace these words with numbers to make the equation hold.

(Wish-Congratulations) ×× Spring × (Good Festival) =9

Zhu-(He Chun)-Anta = 1

Wish+Congratulations+Spring-(Festival+Beautiful) =9

Zhu-He+Chun× (Good Festival) =7

4. Solve the application problem by listing the linear equation of one yuan: Xiao Fang will deposit 2000 yuan in the Spring Festival red envelope into the bank's education savings. Three years later, she retrieved 2 180 yuan from the bank and asked the bank what the annual interest rate was.