Xiao Ming borrows 500 yuan from his mother and 500 yuan from his father to buy a pair of shoes worth 970 yuan. There are 30 yuan left and 10 yuan each to his mother and father, Leave 10 yuan for yourself, 490 yuan for mom and Dad, 490 + 490 = 980 + 10 yuan for yourself, where is the remaining 10 yuan

Agree upstairs, you return 20 yuan to parents, then owe parents a total of 980 yuan, the remaining 20 yuan you have also been ah
In addition, the question upstairs is actually 3 * 9 = 27 + 3 (refund each of them 1 yuan) = 30
And the 2 yuan is actually deducted from those people's 27 yuan

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1. Borrow mom and dad 500, spend 970, leave 30, everyone still 10, leave 10 also owe 490490 * 2 + 10 equal to 990 yuan, where is the remaining 10 yuan?
2. The child asked his mother for 500 yuan and his father for 500 yuan for his birthday. He bought a pair of shoes and used 970 yuan, leaving 30 yuan. He returned 10 yuan to his mother, 10 yuan to his father, and 10 yuan to himself. That is to say, he now owes his mother 490 yuan and his father 490 yuan, plus his 10 yuan 490 × 2 + 10 = 990 yuan, where is the remaining 10 yuan?
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11. Xiao Ming borrowed 500 yuan from his father and 500 yuan from his mother. It cost 970 yuan to buy a pair of shoes. He returned 10 yuan to his father and 10 yuan to his mother. That's 490 yuan to his father and 490 yuan to his mother, a total of 980 yuan. In addition, Xiao Ming's 10 yuan is 990 yuan. Where is the other 10 yuan
12. Xiao Ming borrowed 500 from his parents and bought a pair of shoes 970. There was 30 left. He gave 10 yuan to his father, 10 yuan to his mother, and 10 yuan to himself. Finally, he had to return 49 yuan to his parents. He asked: father 49 yuan, mother 49 yuan, and he had 10 yuan, a total of 99 yuan. What about 10 yuan?
13. I borrowed 500 from my father, borrowed 500 from my mother, bought a pair of shoes, and used 970. The remaining 30 yuan, 10 yuan for my father, 10 yuan for my mother, and 10 yuan for myself I borrowed 500 from my father, borrowed 500 from my mother, bought a pair of shoes, and used 970. The remaining 30 yuan, I returned 10 yuan to my father, 10 yuan to my mother, I left 10 yuan, I owed 490 yuan to my father, 490490 yuan to my mother, 490 yuan = 980. Plus my own 10 yuan = 990 yuan, where are the other 10 yuan? Have you been surrounded?
14. Today, I went shopping, 500 yuan from my father, 500 yuan from my mother, and bought a pair of shoes. I spent 970 yuan, 30 yuan left, 10 yuan for my father, 10 yuan for my mother, 10 yuan for myself, 490 yuan for my father, 490 yuan for my mother, 490 + 490 = 980. Plus 10 yuan for myself, 980 + 10 = 990, where's 10 yuan
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16. Borrow 500 from my father, borrow 500 from my mother, it cost 970 to buy things, 30 left, 10 yuan for my father, 10 yuan for my mother, 10 yuan for myself, 490 for my father, 490 for my mother I borrowed 500 from my father and 500 from my mother. It cost 970 to buy things, but there was 30 left, 10 yuan for my father, 10 yuan for my mother, 10 yuan for myself, 490 yuan for my father, 490 yuan for my mother, 980 yuan in total, and 10 yuan for myself, 990 yuan in total. Where is the remaining 10 yuan!
17. Xiao Ming asked his mother to borrow 500 yuan and his father to borrow 500 yuan. He used 970 yuan to buy things and left 30 yuan Xiao Ming asked his mother to borrow 500 yuan and his father to borrow 500 yuan. He used 970 yuan to buy things and left 30 yuan. Later, he returned 10 yuan to his mother and 10 yuan to his father. The remaining 10 yuan is for his own use. Now he owes 490 yuan to his mother and 490 yuan to his father. A total of 980 yuan is owed, plus his own 10 yuan, a total of 490 yuan?
18. Xiao Ming borrows 500 yuan from his parents to buy shoes, which is 970 yuan. Then Xiao Peng returns 10 yuan to his parents. That is to say, Xiao Ming owes his parents 490 + 490 + 10 yuan, which is 990 yuan Xiao Ming borrows 500 yuan from his parents to buy shoes, which is 970 yuan. Then Xiao Peng returns 10 yuan to his parents. That is to say, Xiao Ming owes his parents 490 + 490 + 10 yuan, which is 990 yuan Where's 10 more?
19. Xiao Ming borrows 500 yuan each from his parents to buy a pair of 970 yuan shoes, gets 30 yuan back and returns 10 yuan each to his parents, but he only owes 490 yuan and 49 yuan each to his parents 0 times 2 plus 10 yuan left, why only 990 yuan?
20. Xiao Ming asked his parents that they borrowed 500 and bought a pair of 970 shoes, and gave them 10 yuan for the remaining 30. So 490 + 490 + 10 = 990, where is the other 10