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计算(后两题用简便方法计算)(1)20+(-14)-(18)-13(2)(-37)+56-(-217)+(-56)(3)(-3.2)×310+(-6.8)×310(4)(-81)÷94×49÷(-16)(5)(-12+23-14)×(-24)(6)-91819×5.
题目详情
计算(后两题用简便方法计算)
(1)20+(-14)-(18)-13
(2)(-
)+
-(-2
)+(-
)
(3)(-3.2)×
+(-6.8)×
(4)(-81)÷
×
÷(-16)
(5)(-
+
-
)×(-24)
(6)-9
×5.
(1)20+(-14)-(18)-13
(2)(-
3 |
7 |
5 |
6 |
1 |
7 |
5 |
6 |
(3)(-3.2)×
3 |
10 |
3 |
10 |
(4)(-81)÷
9 |
4 |
4 |
9 |
(5)(-
1 |
2 |
2 |
3 |
1 |
4 |
(6)-9
18 |
19 |
▼优质解答
答案和解析
(1)20+(-14)-(18)-13
=6-18-13
=-25
(2)(-
)+
-(-2
)+(-
)
=(-
)-(-2
)+(-
)+
=1
+0
=1
(3)(-3.2)×
+(-6.8)×
=(-3.2-6.8)×
=(-10)×
=-3
(4)(-81)÷
×
÷(-16)
=(-36)×
÷(-16)
=(-16)÷(-16)
=1
(5)(-
+
-
)×(-24)
=(-
)×(-24)+
×(-24)-
×(-24)
=12-16+6
=2
(6)-9
×5
=(-9-
)×5
=(-9)×5-
×5
=-45-4
=-49
=6-18-13
=-25
(2)(-
3 |
7 |
5 |
6 |
1 |
7 |
5 |
6 |
=(-
3 |
7 |
1 |
7 |
5 |
6 |
5 |
6 |
=1
5 |
7 |
=1
5 |
7 |
(3)(-3.2)×
3 |
10 |
3 |
10 |
=(-3.2-6.8)×
3 |
10 |
=(-10)×
3 |
10 |
=-3
(4)(-81)÷
9 |
4 |
4 |
9 |
=(-36)×
4 |
9 |
=(-16)÷(-16)
=1
(5)(-
1 |
2 |
2 |
3 |
1 |
4 |
=(-
1 |
2 |
2 |
3 |
1 |
4 |
=12-16+6
=2
(6)-9
18 |
19 |
=(-9-
18 |
19 |
=(-9)×5-
18 |
19 |
=-45-4
14 |
19 |
=-49
14 |
19 |
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