1.因式分解(t+1)^3-(t-1)^3
2.因式分解
2x(2x-y)^2-y(y-2x)^2
1.因式分解(t+1)^3-(t-1)^3
2.因式分解
2x(2x-y)^2-y(y-2x)^2
1.(t+1)^3-(t-1)^3
=[(t+1)-(t-1)][(t+1)^2+(t+1)(t-1)+(t-1)^2]
=2 * [3t^2+1]
=6t^2+2
2.
2x(2x-y)^2-y(2x-y)^2
=(2x-y)(2x-y)^2
=(2x-y)^3
1.因式分解(t+1)^3-(t-1)^3
解答: [(t+1)-(t-1)][(t+1)^2+(t+1)(t-1)+(t-1)^2]
=2 * [3t^2+1]
=6t^2+2
2.因式分解
2x(2x-y)^2-y(y-2x)^2
解答: 2x(2x-y)^2-y(2x-y)^2
=(2x-y)(2x-y)^2
=(2x-y)^3
请问你学过 立方差公式 吗???