计算:(1)-3-4+19-11+2;(2)23?18?(?13)+(?38);(3)(?23+34?56)×12;(4)(?5)?(?5)×15×(?4);
计算:(1)-3-4+19-11+2;(2)23?18?(?13)+(?38);(3)(?23+34?56)×12;(4)(?5)?(?5)×15×(?4);(5)?15...
计算:(1)-3-4+19-11+2;(2)23?18?(?13)+(?38);(3)(?23+34?56)×12;(4)(?5)?(?5)×15×(?4);(5)?1513?317?423+817;(6)?14?13×[21?(?3)2].
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(1)-3-4+19-11+2=-18+21=3;
(2)
?
?(?
)+(?
)=
+
-
?
=
;
(3)(?
+
?
)×12=?
×12+
×12?
×12=-8+9-10=-9;
(4)(?5)?(?5)×
×(?4)=-5+4=-1;
(5)?15
?3
?4
+8
;=?15
?4
?3
+8
=-20+5=-15;
(6)?14?
×[21?(?3)2]=-1-
×12=-1-4=-5.
(2)
2 |
3 |
1 |
8 |
1 |
3 |
3 |
8 |
2 |
3 |
1 |
3 |
1 |
8 |
3 |
8 |
1 |
2 |
(3)(?
2 |
3 |
3 |
4 |
5 |
6 |
2 |
3 |
3 |
4 |
5 |
6 |
(4)(?5)?(?5)×
1 |
5 |
(5)?15
1 |
3 |
1 |
7 |
2 |
3 |
1 |
7 |
1 |
3 |
2 |
3 |
1 |
7 |
1 |
7 |
(6)?14?
1 |
3 |
1 |
3 |
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