2025年通城学典课时作业本七年级数学上册湘教版


注:目前有些书本章节名称可能整理的还不是很完善,但都是按照顺序排列的,请同学们按照顺序仔细查找。练习册 2025年通城学典课时作业本七年级数学上册湘教版 答案主要是用来给同学们做完题方便对答案用的,请勿直接抄袭。



《2025年通城学典课时作业本七年级数学上册湘教版》

1. 计算:
(1)$-5+(-232)-(-65)-(+68)$;
(2)$\frac{1}{2}-(+3\frac{1}{4})+\vert -1\frac{1}{2}\vert -(-3.25)$;
(3)$2\frac{5}{6}× (-1\frac{1}{2})× \frac{6}{17}÷ (-\frac{2}{3})$;
(4)$(-2)^{3}× (-\frac{1}{4}+\frac{3}{2}-\frac{5}{8})$;
(5)$(\frac{1}{2}+\frac{5}{6}-\frac{7}{12})÷ (-\frac{1}{36})$;
(6)$-2^{2}× (-\frac{1}{2})^{2}+(\frac{3}{4}-\frac{1}{6}+\frac{3}{8})× (-24)$。
答案: 1.(1)原式=-5+(-232)+(+65)+(-68)=[-5+(+65)]+[(-232)+(-68)]=60+(-300)=-240 (2)原式=$\frac{1}{2}-(+3\frac{1}{4})+\vert -1\frac{1}{2}\vert -(-3\frac{1}{4})=\frac{1}{2}+(-3\frac{1}{4})+1\frac{1}{2}+3\frac{1}{4}=(\frac{1}{2}+1\frac{1}{2})+[(-3\frac{1}{4})+3\frac{1}{4}]=2+0=2$
(3)原式=$\frac{17}{6}×(-\frac{3}{2})×\frac{6}{17}×(-\frac{3}{2})=\frac{17}{6}×\frac{6}{17}×[(-\frac{3}{2})×(-\frac{3}{2})]=1×\frac{9}{4}=\frac{9}{4}$ (4)原式=-8×$(-\frac{1}{4}+\frac{3}{2}-\frac{5}{8})=-8×(-\frac{1}{4})-8×\frac{3}{2}-8×(-\frac{5}{8})=2-12+5=-5$ (5)原式=$(\frac{1}{2}+\frac{5}{6}-\frac{7}{12})×(-36)=\frac{1}{2}×(-36)+\frac{5}{6}×(-36)-\frac{7}{12}×(-36)=-18-30+21=-27$
(6)原式=-4×$\frac{1}{4}+\frac{3}{4}×(-24)-\frac{1}{6}×(-24)+\frac{3}{8}×(-24)=-1-18+4-9=-24$
2. 计算:
(1)$(-3.5)× (-\frac{1}{4})+0.25× 24.5+(-5\frac{1}{2})× 25\%$;
(2)$0.7× 19\frac{4}{9}+2\frac{3}{4}× (-14)+0.7× \frac{5}{9}+\frac{1}{4}× (-14)$;
(3)$\frac{1}{14}× (-\frac{1}{16})-\frac{13}{14}÷ 16+3× \frac{1}{16}$;
(4)$-5× \frac{2}{3}+6× \frac{2}{7}+\frac{1}{3}× (-5)-\frac{2}{7}× (-8)$。
答案: 2.(1)原式=(-3.5)×$(-\frac{1}{4})+\frac{1}{4}×24.5+(-5\frac{1}{2})×\frac{1}{4}=(3.5+24.5-5\frac{1}{2})×\frac{1}{4}=\frac{45}{2}×\frac{1}{4}=\frac{45}{8}$ (2)原式=0.7×$(19\frac{4}{9}+\frac{5}{9})+(-14)×(2\frac{3}{4}+\frac{1}{4})=0.7×20+(-14)×3=14+(-42)=-28$ (3)原式=$\frac{1}{14}×(-\frac{1}{16})-\frac{13}{14}×\frac{1}{16}+3×\frac{1}{16}=(-\frac{1}{14}-\frac{13}{14}+3)×\frac{1}{16}=2×\frac{1}{16}=\frac{1}{8}$ (4)原式=(-5)×$(\frac{2}{3}+\frac{1}{3})+(6×\frac{2}{7}+\frac{2}{7}×8)=(-5)×(\frac{2}{3}+\frac{1}{3})+\frac{2}{7}×(6+8)=-5+4=-1$

查看更多完整答案,请扫码查看

关闭