题目内容
计算:
(1)23-17-(-7)+(-16)
(2)(-0.5)+(+3
)+(+2.75)+(-5
)
(3)240
÷(-48)
(4)(
-3.75+
)×(-12)-0.252÷(-
)4.
(1)23-17-(-7)+(-16)
(2)(-0.5)+(+3
| 1 |
| 4 |
| 1 |
| 2 |
(3)240
| 24 |
| 39 |
(4)(
| 7 |
| 3 |
| 7 |
| 6 |
| 1 |
| 2 |
(1)原式=23-17+7-16=30-33
=-3;
(2)原式=-
+3
+2
-5
=-
-5
+3
+2
=-6+6
=0;
(3)原式=(240+
)÷(-48)
=240÷(-48)+
÷(-48)
=-5-
=-5
;
(4)原式=(
-
+
)×(-12)-(
)2÷
=
×(-12)-
×(-12)+
×(-12)-
×16
=-28+45-14-1
=-43+45
=2.
=-3;
(2)原式=-
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 2 |
=-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
=-6+6
=0;
(3)原式=(240+
| 24 |
| 39 |
=240÷(-48)+
| 24 |
| 39 |
=-5-
| 1 |
| 78 |
=-5
| 1 |
| 78 |
(4)原式=(
| 7 |
| 3 |
| 15 |
| 4 |
| 7 |
| 6 |
| 1 |
| 4 |
| 1 |
| 16 |
=
| 7 |
| 3 |
| 15 |
| 4 |
| 7 |
| 6 |
| 1 |
| 16 |
=-28+45-14-1
=-43+45
=2.
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