分解因式:
1. -1/25m²+16
2. 16(x-1)²-(x+2)²
3. a²-(b+c)²
4. a²+ax-b²+bx
5. (a-b)(a²-ab+b²)-ab(a-b)
6. (x+y)²+4(x-y)²-4(x²-y²)
分解因式:
1. -1/25m²+16
2. 16(x-1)²-(x+2)²
3. a²-(b+c)²
4. a²+ax-b²+bx
5. (a-b)(a²-ab+b²)-ab(a-b)
6. (x+y)²+4(x-y)²-4(x²-y²)
1. -1/25m²+16=(4-1/5m)*(4+1/5m)
2. 16(x-1)²-(x+2)²=[4(x-1)-(x+2)]*[4(x-1)+(x+2)]=(3x-6)*(5x-2)
3. a²-(b+c)²=(a-b-c)*(a+b+c)
4. a²+ax-b²+bx=(a-b)*(a+b)+(a+b)*x=(a+b)*(a-b+x)
5. (a-b)(a²-ab+b²)-ab(a-b)=(a-b)*(a²-ab+b²-ab)=(a-b)^3
6. (x+y)²+4(x-y)²-4(x²-y²)=(x+y)²+4(x-y)²-4(x-y)*(x+y)=[(x+y)-2(x-y)]²=(3y-x)²
1.(4+1/5m)(4-1/5m)
2.(5x-2)(3x-3)
1 (4-1/5m)*(4+1/5m)
2 (3x-6)*(5x-2)
3 (a-b-c)*(a+b+c)