
计算:(1)217?323?513+(?317);(2)(134?78?712)÷(?78)+(?83);(3)-14-(-3)2÷214×(13)2
计算:(1)217?323?513+(?317);(2)(134?78?712)÷(?78)+(?83);(3)-14-(-3)2÷214×(13)2....
计算:(1)217?323?513+(?317);(2)(134?78?712)÷(?78)+(?83);(3)-14-(-3)2÷214×(13)2.
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(1)原式=2
-3
-(3
+5
)
=-1-9
=-10;
(2)原式=-(
-
-
)×
-
=-2+1+
-
=-2+1-2
=-3;
(3)原式=-1-9×
×
=-1-
=-1
.
1 |
7 |
1 |
7 |
2 |
3 |
1 |
3 |
=-1-9
=-10;
(2)原式=-(
7 |
4 |
7 |
8 |
7 |
12 |
8 |
7 |
8 |
3 |
=-2+1+
2 |
3 |
8 |
3 |
=-2+1-2
=-3;
(3)原式=-1-9×
4 |
9 |
1 |
9 |
=-1-
4 |
9 |
=-1
4 |
9 |
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