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D; 2x+5≠0
2x≠-5
x≠-2½
D:x∈R\{-2½}
b)
x-1≠0
x≠1
x+7≠0
x≠-7
D: x∈R\{-7;1}
c)
3x-4≠0
3x≠4
x≠1¼
5x-1≠0
5x≠1
x≠⅕
D;x∈R\{⅕;1¼}