When x respectively takes the following values, find the value of the algebraic formula x2 + 2x-1 x=3 x=1/2

When x = 3, the original formula = 3 + 2 × 3-1 = 14; when x = 1 / 2, the original formula = (1 / 2) + 2 × 1 / 2-1 = 1 / 4. Study hard, child

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