A mathematical problem about fraction in grade two of junior high school When calculating a + [(bc-a ^ 2) / (a ^ 2 + B ^ 2 + C ^ 2)] (a, B, C are not equal to each other), Xiao Fang found that if a and B are exchanged, the value of this formula is unchanged; if a and C are exchanged, the value of this formula is also unchanged. For example, a + B + C = 1, the constant value is obtained Seek a clear solution process

A mathematical problem about fraction in grade two of junior high school When calculating a + [(bc-a ^ 2) / (a ^ 2 + B ^ 2 + C ^ 2)] (a, B, C are not equal to each other), Xiao Fang found that if a and B are exchanged, the value of this formula is unchanged; if a and C are exchanged, the value of this formula is also unchanged. For example, a + B + C = 1, the constant value is obtained Seek a clear solution process

How do you get this step from the question: a + (bc-a ^ 2) / (a ^ 2 + B ^ 2 + C ^ 2) = B + (AC-B ^ 2) / (a ^ 2 + B ^ 2 + C ^ 2)
？
This is indeed the original topic, and the topic should be correct. The original question is a + B + C = 1, not 0