设 [tex=0.786x1.0]AOSTmhvIsOwsdZlGoks7dg==[/tex] 是有单位元[tex=0.5x0.786]rCTQ93hYjIOF3vc8FasIqg==[/tex]的环,[tex=3.143x1.214]JFbgl2n1b/FGXdU+iokzgA==[/tex](1) 证明: 如果 [tex=4.071x1.214]51o1ZKR+w6RI/EZkkD8ysg==[/tex] 都可逆, 则[tex=4.071x1.357]Jq3DArGB5RLWm9mNakgs8g==[/tex] 也可逆;(2) 求 [tex=6.357x1.714]1iUql5y7RpgX4l38zQwx4N+Ig2NRA6QFRAQkAIu4mBtaIpLzvLYbqyQJViVbox2b[/tex]
设 [tex=0.786x1.0]AOSTmhvIsOwsdZlGoks7dg==[/tex] 是有单位元[tex=0.5x0.786]rCTQ93hYjIOF3vc8FasIqg==[/tex]的环,[tex=3.143x1.214]JFbgl2n1b/FGXdU+iokzgA==[/tex](1) 证明: 如果 [tex=4.071x1.214]51o1ZKR+w6RI/EZkkD8ysg==[/tex] 都可逆, 则[tex=4.071x1.357]Jq3DArGB5RLWm9mNakgs8g==[/tex] 也可逆;(2) 求 [tex=6.357x1.714]1iUql5y7RpgX4l38zQwx4N+Ig2NRA6QFRAQkAIu4mBtaIpLzvLYbqyQJViVbox2b[/tex]
1