![](https://iknow-base.cdn.bcebos.com/lxb/notice.png)
计算:(1)-20+(-14)-(-18)-13;(2)3×23÷(-3);(3)(12-59+712)×(-36);(4)2×(?3)2+
计算:(1)-20+(-14)-(-18)-13;(2)3×23÷(-3);(3)(12-59+712)×(-36);(4)2×(?3)2+5÷12×(?2)....
计算:(1)-20+(-14)-(-18)-13;(2)3×23÷(-3);(3)(12-59+712)×(-36);(4)2×(?3)2+5÷12×(?2).
展开
展开全部
解(1)-20+(-14)-(-18)-13
=-20+(-14)+(+18)+(-13)
=-20-14+18-13
=-47+18
=-29;
(2)3×23÷(-3)
=3×8×(-
)
=-8;
(3)(
-
+
)×(-36)
=
×(-36)-
×(-36)+
×(-36)
=-18+20-21
=-17;
(4)2×(?3)2+5÷
×(?2)
=2×9+5×2×(-2)
=18-20
=-2.
=-20+(-14)+(+18)+(-13)
=-20-14+18-13
=-47+18
=-29;
(2)3×23÷(-3)
=3×8×(-
1 |
3 |
=-8;
(3)(
1 |
2 |
5 |
9 |
7 |
12 |
=
1 |
2 |
5 |
9 |
7 |
12 |
=-18+20-21
=-17;
(4)2×(?3)2+5÷
1 |
2 |
=2×9+5×2×(-2)
=18-20
=-2.
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询