因式分解3xy³-3xy,0.04x²-0.81y²

分类: 作业答案 • 2022-01-09 18:04:57

问题描述：

答

3xy³-3xy
=3xy(y²-1)
=3xy(y+1)(y-1)
0.04x²-0.81y²
=(0.2x)²-(0.9y)²
=(0.2x+0.9y)(0.2x-0.9y)