早教吧作业答案频道 -->数学-->
(2x-3/5y-1/3z)(3/5y-1/3y+2x)帮忙哈!
题目详情
(2x-3/5y-1/3z)(3/5y-1/3y+2x)帮忙哈!
▼优质解答
答案和解析
[2x-(3/5)y-(1/3)z][(3/5)y-(1/3)z+2x]={[2x-(1/3)z]-(3/5)y}{[2x-(1/3)z]+(3/5)y}
=[2x-(1/3)z]²-(9/25)y²=4x²-(4/3)xz+(1/9)z²-(9/25)y²
=4x²-(9/25)y²+(1/9)z²-(4/3)xz.
[原题有错,已改正]
=[2x-(1/3)z]²-(9/25)y²=4x²-(4/3)xz+(1/9)z²-(9/25)y²
=4x²-(9/25)y²+(1/9)z²-(4/3)xz.
[原题有错,已改正]
看了 (2x-3/5y-1/3z)...的网友还看了以下：