1. 4+12(x-y)+9(x-y)²
2. x³-9x
3. 16x的四次方-1
4. 6xy²-9x²y-y³
1. 4+12(x-y)+9(x-y)²
2. x³-9x
3. 16x的四次方-1
4. 6xy²-9x²y-y³
1. 4+12(x-y)+9(x-y)²
=[4+9(x-y)][1+(x-y)]
=(4+9x-9y)(1+x-y)
2. x³-9x
=x(x²-9)
=x(x+3)(x-3)
3. 16x的四次方-1
=(4x²)²-1
=(4x²+1)(4x²-1)
=(4x²+1)(2x+1)(2x-1)
4. 6xy²-9x²y-y³
=-y(9x²-6xy+y²)
=-y(3x-y)²
1 [3(X-Y)+2]²
2 X(X+3)(X-3)
3 (2X+1)(2X-1)(4X²+1)
4 -y(3X-y)²