2026年计算100七年级数学上册苏科版第25页答案
1. 计算:
(1) $(-5)×(+2)×(-3)×7$;
(2) $(-8)×4×(-\dfrac{1}{2})×(-\dfrac{3}{5})$;
(3) $(-4)×(-0.125)×(-25)×0$;
(4) $(-\dfrac{8}{9})×(-0.25)×\dfrac{1}{4}×(-9)$;
(5) $\dfrac{7}{10}×(-\dfrac{13}{14})×(-\dfrac{5}{9})×(-\dfrac{6}{13})$;
(6) $1.2×(-2\dfrac{4}{5})×(-2.5)×(-\dfrac{3}{7})$;
(7) $(-1\dfrac{4}{5})×(-1\dfrac{1}{9})×(+5\dfrac{1}{2})×\dfrac{3}{11}$;
(8) $[9×(-4)]×(-\dfrac{1}{4})$。

答案

(1) $210$
(2) $-\dfrac{48}{5}$
(3) $0$
(4) $-\dfrac{1}{2}$
(5) $-\dfrac{1}{6}$
(6) $-\dfrac{18}{5}$
(7) $3$
(8) $9$
2. 计算:
(1)$(-9)×(-48)+(-9)×(-32)$;
(2)$25×\frac{3}{4}+(-25)×\frac{1}{2}+25×(-\frac{1}{4})$。

答案

(1) $720$
(2) $0$