计算:(1)23-17-(-7)+(-16)(2)(-0.5)+(+314)+(+2.75)+(-512)(3)2402439÷(-48)(4)
计算:(1)23-17-(-7)+(-16)(2)(-0.5)+(+314)+(+2.75)+(-512)(3)2402439÷(-48)(4)(73-3.75+76)×...
计算:(1)23-17-(-7)+(-16)(2)(-0.5)+(+314)+(+2.75)+(-512)(3)2402439÷(-48)(4)(73-3.75+76)×(-12)-0.252÷(-12)4.
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(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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