[질문] 7,28,29번답좀

26.21/2 27.(1)3/2(a+2)(a-1)(2)15(3)(4.16) (4)y=13/7x+24/7 28.(1)√3(2)-3/4(3)9/4(4)32√3/27 29.(1)a=1/2m=-1n=4 (2)l=-1/2t^-t+4(3)-1-√2