1. If the positive numbers a, B and C are three sides of the triangle and satisfy a ^ 4 + B ^ 4 + C ^ 4 = a ^ 2B ^ 2 + B ^ 2C ^ 2 + A ^ 2C ^ 2, try to determine the shape of the triangle 2. Decomposition factor A ^ 2 + B ^ 2 + C ^ 2 + 2ab-2ac-2bc 3. Factorization-4z ^ 2 + 4z-1

1. If the positive numbers a, B and C are three sides of the triangle and satisfy a ^ 4 + B ^ 4 + C ^ 4 = a ^ 2B ^ 2 + B ^ 2C ^ 2 + A ^ 2C ^ 2, try to determine the shape of the triangle 2. Decomposition factor A ^ 2 + B ^ 2 + C ^ 2 + 2ab-2ac-2bc 3. Factorization-4z ^ 2 + 4z-1

1. It's an equilateral triangle that multiplies both sides by 2
Then move the one on the right
formula
Become (a ^ 2-B ^ 2) ^ 2 + (b ^ 2 - ^ 2) ^ 2 + (a ^ 2-C ^ 2) ^ 2 = 0
Everything is zero
So it's an equilateral triangle
2.（a+b-c)^2
This is a formula
3. Extract a negative sign
Get - (4Z ^ 2-4z + 1)
It's equal to - (2z-1) ^ 2