Question

聪明的哥哥姐姐们,帮我算道数学题吧

Answer 1

[1/（a-2)+a/（a²+a-2)]÷(a/a+2)²

=[(1/a-2)+(a+a-2)]÷(1+2)²

=[(1/a-2)+(2a-2)]÷9

=[(1/a-2)+2a-2]÷9

=[(1/a-2)+(1/2a)-2] ÷9

=[(1/a-2)+(a-2/2a×（a-2）-2] ÷9

=[(1/a-2)+(a-2/2a×a-4a)-2]÷9

=1+2a×-4a/9a-18