Phân tích : ( x+y)⁴ ra hằng đẳng thức giúp mk

Giải pt sau:

a) \(\left(\dfrac{8}{1.9}+\dfrac{8}{9.17}+\dfrac{8}{17.25}+....+\dfrac{8}{49.57}\right)+2.\left(x-1\right)=\dfrac{2x+7}{3}+\dfrac{5x-8}{4}\)

b) \(\left(x+2\right).\left(x-2\right).\left(x^2-10\right)=72\)

c) (x+3)⁴+ (x+5)⁴ = 2

Do you hate walking to school? Why?