X^2+X+4分之1
=(x+1/2)²
=1/4(2x+1)²
9分之M^2+3分之2MN+N^2
=(M/3+N)²
=1/9(M+3N)²
-3X^4+6X^3Y-3X^2Y^2
=-3x^2(x^2-2xy+y^2)
=-3x^2(x-y)^2
(X^2+4X)^2+8(X^2+4X)+16
=(x^2+4x+4)^2
=(x+2)^4
X^2+X+4分之1
=(x+1/2)²
=1/4(2x+1)²
9分之M^2+3分之2MN+N^2
=(M/3+N)²
=1/9(M+3N)²
-3X^4+6X^3Y-3X^2Y^2
=-3x^2(x^2-2xy+y^2)
=-3x^2(x-y)^2
(X^2+4X)^2+8(X^2+4X)+16
=(x^2+4x+4)^2
=(x+2)^4