x³-2x²=?a²-9b²=?5x²y-20y³=?3a³b²-6a²b+3a=?

x³-2x²=?a²-9b²=?5x²y-20y³=?3a³b²-6a²b+3a=?
x³-2x²=?a²-9b²=?5x²y-20y³=?3a³b²-6a²b+3a=?

x³-2x²=?a²-9b²=?5x²y-20y³=?3a³b²-6a²b+3a=?
x³-2x²=x²*（x-2）
a²-9b²=a²-（3b)²=（a-3b）（a+3b）
5x²y-20y³=5y(x²-4y²）=5y[x²-（2y)²]=5y(x-2y)(x+2y)
3a³b²-6a²b+3a=3a(a²b²-2ab+1)=3a(ab-1)²

x³-2x²=x²(x-2)
a²-9b²=(a+3b)(a-3b)
5x²y-20y³=5y(x²-4y²)=5y(x+2y)(x-2y)
3a³b²-6a²b+3a=3a(a²b²-2ab+1)=3a(ab-1)²

546