4a^2+9b^2+25c^2=4a+6b+10c-3

4a^2 + 9b^2 + 25c^2 = 4a + 6b + 10c - 3
4a^2 + 9b^2 + 25c^2 - 4a - 6b - 10c + 3 = 0
4a^2 + 9b^2 + 25c^2 - 4a - 6b - 10c + 3
= (4a^2 - 4a + 1) + (9b^2 - 6b + 1) + (25c^2 - 10c + 1)
= (2a - 1)^2 + (3b - 1)^2 + (5c - 1)^2
a = 1/2
b = 1/3
c = 1/5

问什么答什么呀，怎么不写完整。