2026年计算100七年级数学上册苏科版第27页答案
1. 计算:
(1) $-(-2 \frac{1}{2}) × (-\frac{1}{10}) × \left| -3 \frac{1}{5} \right|$;
(2) $\frac{1}{2} × \left| -\frac{2}{7} \right| × 2 \frac{1}{4} × (-4 \frac{1}{5})$;
(3) $(-7.3) × 42.07 + (-2.07) × (-7.3)$;
(4) $(-7) × (-\frac{22}{7}) + 19 × (-\frac{22}{7}) -5 × (-\frac{22}{7})$;
(5) $\frac{4}{5} × (-\frac{5}{13}) - \frac{3}{5} × (-\frac{5}{13}) - \frac{5}{13} × (-1 \frac{3}{5})$;
(6) $(-3.61) × 0.75 + 0.61 × \frac{3}{4} + (-0.2) × 75\%$。

答案

(1) $-\dfrac{4}{5}$
(2) $-\dfrac{27}{20}$
(3) $-292$
(4) $-22$
(5) $\dfrac{7}{13}$
(6) $-2.4$
2. 计算:
(1)$-13×\frac{2}{3} - 0.14×\frac{2}{7} + \frac{1}{3}×(-13) - \frac{5}{7}×0.14$;
(2)$(\frac{3}{4} - \frac{5}{6} + \frac{7}{9})×36 - 6×1.45 + 3.95×6$。

答案

(1) $-13.14$
(2) $40$