急！急！急！！救命，全是因式分解。

1.=(x-3+4)^2=(x+1)^2
2.=3(m^2-2mn+n^2)=3(m-n)^2
3.=(x^2+4)(x^2-4)=(x^2+4)(x+2)(x-2)
4.=2(x^4-8x^2+16)=2(x^2-4)^2=2(x+2)^2(x-2)^2
5.=(X-2)(X^2+2X+4)
6=3(X^3+8)=3(x+2)(X^2-2x+4)
7=a^2-(b^2-2bc+c^2)=a^2-(b-c)^2=(a+b-c)(a-b+c)
8=(a+B+C)^3
9=(3(x-y)-4)^2
10=(a-b-c)^2
11=(2x-2(y-1))^2
12=a^2-a-a^3+a^2=a(a-1)-a^2(a-1)=(a-1)(a-a^2)=-a(a-1)^2
13=3a(x+y)(x-y)
14=-4a(4a^2-4ab+b^2)=-4a(2a-b)^2
15=(y^2-1)(x^2-1)=(y+1)(y-1)(X+1)(x-1) 希望采纳

1.原式=[(x-3)+4]²=(x-1)²
2.=3(m²-2mn+n²)=3(m-n)²
3.=(x²+4)(x²-4)=(x²+4)(x+2)(x-2)
4.=2[x²-4]²
5.=(x-2)(x²+2x+4)
6.=3(x³+8)=(x+2)(x²-2x+4)