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2/3√9x+6√x/4
2/3×2/3×2/3×2/3
2<()<()<3
2+2²+2³+……+2
2/3×1/2÷2/3×1/2
2/9×3/8÷6/7
π/2<β<α<3π/4
-2+2×(-4)²
2/5×4÷2/5×4
2+√2=2√2
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