Tính (1 điểm)

$\frac{1}{2}\times \left(\frac{7}{16}+\frac{3}{8}\right)$ = ………………………………… = …………………………………

$\left(\frac{31}{7}-2\right):\frac{5}{2}$ = ………………………………… = …………………………………

247 239 × 24

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239 718 : 32

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