Question

数学 因式分解问题

1 。a4－3a2－4
2.(x-y)a-x+y
3. 2x3－16y3
4. 5x2-13xy-6y2
5．x3+2x2-10x-20
一张卷我就只剩这几道题不会了 大家帮帮忙 要详细的过程好吧 过程详细！

Answer 1

1 。a4－3a2－4
=(a²-4)(a²+1)
=(a+2)(a-2)(a²+1)

2.(x-y)a-x+y
=a(x-y)-(x-y)
=(x-y)(a-1)

3. 2x³－16y³
=2(x³-8y³)
=2(x-2y)(x²+2xy+4y²)

4. 5x²-13xy-6y²
=5x²+2xy-15xy-6y²
=x(5x+2y)-3y(5x+2y)
=(5x+2y)(x-3y)

5．x3+2x2-10x-20
=x²(x+2)-10(x+2)
=(x+2)(x²-10)