Question

数学 计算 求步骤

Answer 1

13(1) (5x/y)*(y/15x^2)=1/3x.
(2) (2a^2b/x)除以(-2xb)
=(2a^2b/x)*(-1/2xb)
=-a^2/x^2.
(3) 1/(x-1)+1/(x+1)
=(x+1)/(x+1)(x-1)+(x-1)/(x+1)(x-1)
=2x/(x+1)(x-1).
(4) c/ab-a/bc
=c^2/abc-a^2/abc
=(c^2-a^2)/abc.
(5) a-1-a^2/(a-1)
=(a-1)^2/(a-1)-a^2/(a-1)
=(a^2-2a+1-a^2)/(a-1)
=(1-2a(/(a-1).
(6) [(x^2-2x+1)/(x^2-1)]除以[(x-1)/(x^2+x)]
=[(x-1)^2/(x+1)(x-1)]X[x(x+1)/(x-1)]
=x。