1. Three and one eighth × 7.4 - three and one eighth + 3.6 × 3.25 2. Ten and five quarters - (8.8-5 / 7) + 2 / 7 3. 3.14 × 4.3 + 7.2 × 7 / 3-1.5 × 3.14 4、1/2×3+1/2×3+1/3×4…… +1/2010×2011

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