a=2^5
b=5
(4分之一a+5分之一b)(4分之一a-5分之一b)-(4分之一a+5分之一b)的平方
=(1/4*a+1/5*b)(1/4*a-1/5*b)-(1/4*a+1/5*b)^2
=(1/4*a+1/5*b)(1/4*a-1/5*b-1/4*a-1/5*b)
=(1/4*a+1/5*b)(-2/5*b)
=(2^-2*2^5+1/5*5)*(-2/5*5)
=(2^3+1)*(-2)
=-18
a=2^5
b=5
(4分之一a+5分之一b)(4分之一a-5分之一b)-(4分之一a+5分之一b)的平方
=(1/4*a+1/5*b)(1/4*a-1/5*b)-(1/4*a+1/5*b)^2
=(1/4*a+1/5*b)(1/4*a-1/5*b-1/4*a-1/5*b)
=(1/4*a+1/5*b)(-2/5*b)
=(2^-2*2^5+1/5*5)*(-2/5*5)
=(2^3+1)*(-2)
=-18