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x-1≤0
x≤1
2x-1≤0
2x≤1 //:2
x≤1/2
x∈(1/2,1>
b)(x-1)/(2x-1)²≤0
x-1≤0
x≤1
(2x-1)≤0
2x≤1 //:2
x≤1/2
x∈(-∞,1/2)u(1/2,1>