Đáp án+Giải thích các bước giải:
`8)H=((4sqrty)/(2+sqrty)+(8y)/(4-y)):((sqrty-1)/(y-2sqrty)-2/sqrty)`
`H=((4sqrty(sqrty-2))/(y-4)-(8y)/(y-4)):((sqrty-1)/(y-2sqrty)-(2sqrty-4)/(y-2sqrty))`
`H=(4y-8sqrty-8sqrty)/(y-4):(sqrty-1-2sqrty+4)/(y-2sqrty)`
`H=(-4y-8sqrty)/(y-4):(3-sqrty)/(y-2sqrty)`
`H=(-4sqrty(sqrty+2))/((sqrty-2)(sqrty+2))*(sqrty(sqrty-2))/(3-sqrty)`
`H=(4sqrty)/(sqrty-3)`
`9)K=((ysqrty-1)/(y-sqrty)-(ysqrty+1)/(sqrty+y)):(2(y-2sqrty+1))/(y-1)`
`K=(((sqrty-1)(y+sqrty+1))/(sqrty(sqrty-1))-((sqrty+1)(y-sqrty+1))/(sqrty(sqrty+1))):(2(sqrty-1)^2)/((sqrty-1)(sqrty+1))`
`K=((y+sqrty+1-y+sqrty-1)/(sqrty)):(2(sqrty-1))/(sqrty+1))`
`K=(2sqrty)/sqrty*(sqrty+1)/(2(sqrty-1))`
`K=(sqrty+1)/(sqrty-1)`