Question : If $x=\frac{8ab}{a+b}(a\neq b),$ then the value of $\frac{x+4a}{x–4a}+\frac{x+4b}{x–4b}$ is:

Option 1: 0

Option 2: 1

Option 3: 2

Option 4: 4

Question : What is the value of $\frac{(a^2+b^2)(a-b)-(a^3-b^3)}{a^2b-ab^2}?$

Option 1: 0

Option 2: 1

Option 3: –1

Option 4: 3

Question : What is the value of $\frac{(a^2+b^2)(a-b)-(a-b)^3}{a^2b-ab^2}?$

Option 1: $0$

Option 2: $1$

Option 3: $–1$

Option 4: $2$

Question : If $a,b,c$, and $d$ satisfy the equations:
$a+7b+3c+5d=0$, $8a+4b+6c+2d=–4$, $2a+6b+4c+8d=4$, $5a+3b+7c+d=–4$, then $\frac{a+d}{b+c}$?

Option 1: 0

Option 2: 1

Option 3: –1

Option 4: – 4

Question : The value of –7 ÷ [5 + 1 ÷ 2 – {4 + (4 of 2 ÷ 4) + (4 ÷ 4 of 2)}] is:

Option 1: $-\frac{7}{2}$

Option 2: $–7$

Option 3: $\frac{7}{2}$

Option 4: $7$