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(x + 1/2x)(x + 1/2x)
x(x) + x(1/2x) + 1/2x(x) + 1/2x(1/2x)
x² + x/2x + x/2x + 1/4x²
x² + 2x/2x + 1/4x²
x² + 1 + 1/4x²
Jawabannya yang C. x² + 1 + 1/4x²
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