Zhu Shijie, a mathematician in the Yuan Dynasty, compiled Siyuan Jade Mirror on 1303. There is such a title: 999 pence, 1000 pears in time, nine pears in eleven, and four pence for seven fruits. Q: What's the price of pears? The meaning of this question is: you can buy * *1000 pears with 999 pence, 9 pears with 1 1 penny, and 7 pears with 4 pence. How much do you pay for each pear and fruit? Price per pear:11÷ 9 =12/9 (text) Price per fruit: 4 ÷ 7 = 4/7 (text) Fruit number: (12/9×/kloc-0. 7)= 343 number (pear): 1000-343 = 657 (pear) total price: 12/9× 657 = 803 (fruit) total price: 4/7× 343 = 196 (. Y=343 means there are 657 pears, the money is 657* 1 1/9=803, the fruit is 343, and the money is 343*4/7= 196.