The decomposition of 8 is: 1 and 7, 2 and 6, 3 and 5, 4 and 4, 5 and 3, 6 and 2, 7 and 1 = 7,8-2 = 6,8-3 = 5,8-4 =
The composition of 8 is 1 and 7, 2 and 6, 3 and 5, 4 and 4, 5 and 3, 6 and 2, 7 and 1. Expressed by the formula: 1+7=8, 2+6 = 8, 3+5=8, 4+4=8, 5+3=8.
Mathematics teacher's class experience 1
In Yutian No.3 Middle School, I observed two teachers' hi