Xiao Ming borrowed 500 yuan from his father and another 500 yuan from his mother. He bought 970 yuan for a pair of shoes, 30 yuan for his father and 10 yuan for his mother, He left 10 yuan, but he still owed 490 yuan to his father and 490 yuan to his mother. His father's 490 yuan plus his mother's 490 yuan equals 980 yuan, and his 10 yuan equals 990 yuan?

Xiao Ming borrowed 500 yuan from his father and another 500 yuan from his mother. He bought 970 yuan for a pair of shoes, 30 yuan for his father and 10 yuan for his mother, He left 10 yuan, but he still owed 490 yuan to his father and 490 yuan to his mother. His father's 490 yuan plus his mother's 490 yuan equals 980 yuan, and his 10 yuan equals 990 yuan?

Introduction idea 1: Xiaoming's 30kuai is also borrowed from his parents, which can't be calculated separately and said to be returned, that is, 490 + 490 = 980. Without adding Xiaoming's 10kuai, it should be also his parents' 10kuai, which can't be said to be returned, so 490 + 490 = 980.980 minus shoes 970 = 10, which is exactly Xiaoming's 10kuai