问题 解答题
计算:
(1)1.78+3.64-5.25-0.2+0.3-0.33.
(2)1-
9
14
+
8
21
+
1
14
-
17
35
-3
6
7

(3)(-
5
6
+
2
3
)÷(-
7
12
)×
7
2
+(-1)100
(4)-102-[(1-
1
2
)×
1
3
][2-(-3)2]
(5)-2-{8+(-1)2-[(-4)×2÷(-2)+
5
6
×(-6)]}
(6)
1
-0.32
+|-(-
1
5
2-
1
22
1
52
-|-2-3|-
1
0.2
答案

(1)原式=5.42-5.25-0.2+0.3-0.33,

=0.17-0.2+0.3-0.33,

=-0.03+0.3-0.33,

=0.27-0.33,

=-0.06;

(2)原式=-

9
14
+
1
14
+1-3
6
7
+
8
21
-
17
35

=-

8
14
-
20
7
+
8
21
-
7
35

=-

24
7
+
8
21
-
7
35

=-

64
21
-
7
35

=-

64×5
21×5
-
7×3
35×3

=-

320
105
-
21
105

=-

341
105

(3)原式=(-

1
6
)÷(-
7
12
)×
7
2
+(-1)100

=

1
6
×
12
7
×
7
2
+1,

=1+1,

=2;

(4)原式=-102-[

1
2
×
1
3
][2-32],

=-100-

1
6
×(2-9),

=-100-

1
6
×(-7),

=-100+

7
6

=-98

5
6

(5)原式=-2-{8+1-[-8÷(-2)-

5
6
×6]},

=-2-{9+1},

=-2-10,

=-12;

(6)原式=

1
-0.09
+|-
1
25
-
1
4
1
25
-|-5|-
1
0.2

=-

100
9
+
29
100
×25-5-5,

=-

100
9
+
29
4
-10,

=-

400-29×9+360
36

=-

499
36

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