都是完全平方
t²+30t+225
=(t+15)²
9-12x+4x²
=(3-2x)²
m²-m+1/4
=(m-1/2)²
25y²+80y+64
=(5y+8)²
a²-2√3a+3
=(a-√3)²
x²y²+22xy+121
=(xy+11)²
都是完全平方
t²+30t+225
=(t+15)²
9-12x+4x²
=(3-2x)²
m²-m+1/4
=(m-1/2)²
25y²+80y+64
=(5y+8)²
a²-2√3a+3
=(a-√3)²
x²y²+22xy+121
=(xy+11)²