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1 计算：
(1) $5 \frac{3}{5} + (-1 \frac{7}{8}) + 2 \frac{2}{5} + (-3 \frac{5}{12}) + 2 \frac{7}{8} + (-12 \frac{7}{12});$
(2) $(-2021 \frac{5}{6}) + 4043 \frac{2}{3} + (-2022 \frac{2}{3}) + 1 \frac{5}{6}.$
(1) $5 \frac{3}{5} + (-1 \frac{7}{8}) + 2 \frac{2}{5} + (-3 \frac{5}{12}) + 2 \frac{7}{8} + (-12 \frac{7}{12});$
(2) $(-2021 \frac{5}{6}) + 4043 \frac{2}{3} + (-2022 \frac{2}{3}) + 1 \frac{5}{6}.$
答案
(1) -7
(2) 1
(2) 1
2 计算：
(1) $(-12.5) × (+317) × (-\dfrac{4}{5}) × (-0.1)$；
(2) $-1^2 - (\dfrac{2}{3} - \dfrac{7}{8} + \dfrac{1}{12} - \dfrac{5}{6}) × (-24)$；
(3) $-49\dfrac{24}{25} × 10$；
(4) $999 × 118\dfrac{4}{5} + 999 × (-\dfrac{1}{5}) - 999 × 18\dfrac{3}{5}$；
(5) $(-\dfrac{4}{5}) × \dfrac{5}{13} - (-\dfrac{3}{5}) ÷ (-2\dfrac{3}{5}) - \dfrac{5}{13} × (-1\dfrac{3}{5})$。
(1) $(-12.5) × (+317) × (-\dfrac{4}{5}) × (-0.1)$；
(2) $-1^2 - (\dfrac{2}{3} - \dfrac{7}{8} + \dfrac{1}{12} - \dfrac{5}{6}) × (-24)$；
(3) $-49\dfrac{24}{25} × 10$；
(4) $999 × 118\dfrac{4}{5} + 999 × (-\dfrac{1}{5}) - 999 × 18\dfrac{3}{5}$；
(5) $(-\dfrac{4}{5}) × \dfrac{5}{13} - (-\dfrac{3}{5}) ÷ (-2\dfrac{3}{5}) - \dfrac{5}{13} × (-1\dfrac{3}{5})$。
答案
(1) -317
(2) -24
(3) $-499 \dfrac{3}{5}$
(4) 99 900
(5) $\dfrac{1}{13}$
(2) -24
(3) $-499 \dfrac{3}{5}$
(4) 99 900
(5) $\dfrac{1}{13}$
