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计算:(1)-7+3-5+20(2)223+(-223)+(513)-(-512)(3)4.25+(-2.18)-(-2.75)+5.18(4)43-(-87)-2-(13)−17.
题目详情
计算:
(1)-7+3-5+20
(2)2
+(-2
)+(5
)-(-5
)
(3)4.25+(-2.18)-(-2.75)+5.18
(4)
-(-
)-2-(
)−
.
(1)-7+3-5+20
(2)2
2 |
3 |
2 |
3 |
1 |
3 |
1 |
2 |
(3)4.25+(-2.18)-(-2.75)+5.18
(4)
4 |
3 |
8 |
7 |
1 |
3 |
1 |
7 |
▼优质解答
答案和解析
(1)-7+3-5+20
=-7-5+3+20
=-12+23
=11;
(2)2
+(-2
)+(5
)-(-5
)
=2
-2
+5
+5
=10
;
(3)4.25+(-2.18)-(-2.75)+5.18
=4.25-2.18+2.75+5.18
=4.25+2.75+5.18-2.18
=7+3
=10;
(4)
-(-
)-2-(
)−
=
+
-2-
−
=
-
+
−
-2
=1+1-2
=0.
=-7-5+3+20
=-12+23
=11;
(2)2
2 |
3 |
2 |
3 |
1 |
3 |
1 |
2 |
=2
2 |
3 |
2 |
3 |
1 |
3 |
1 |
2 |
=10
5 |
6 |
(3)4.25+(-2.18)-(-2.75)+5.18
=4.25-2.18+2.75+5.18
=4.25+2.75+5.18-2.18
=7+3
=10;
(4)
4 |
3 |
8 |
7 |
1 |
3 |
1 |
7 |
=
4 |
3 |
8 |
7 |
1 |
3 |
1 |
7 |
=
4 |
3 |
1 |
3 |
8 |
7 |
1 |
7 |
=1+1-2
=0.
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