Question

plz solve 13 and 14 and 15

Answer 1

(14)...(5/7)^3/4 × (7/5)^2×3/8

;(5/7)^3/4 × (7/5)^3/4

;{5/7 ×7/5)^3/4

;1^3/4=1

(13)..1-√2/1+√2 × 1-√2/1-√2=-3+m√2

;(1-√2)^2/1^2-(√2)^2=-3+m√2

;1+2-2√2/1-2=-3+m√2

;3-2√2/-1=-3+m√2

;-3+2√2+3=m√2

;2√2/√2=m

;m=2
is your answer