问题 解答题
9.63-7.52-2.49+0.432000-1998+1996-1994+…-6+4-2
1
2
×(0.875×12.4+1+4.4×
7
8
)×
4
3
-
1
4
[1-(
1
12+
1
2
+
1
10
)×2
1
2
11
25
答案

(1)9.63-7.52-2.49+0.43,

=(9.63+0.43)-(7.52+2.49),

=10.06-10.01,

=0.05;

(2)2000-1998+1996-1994+…-6+4-2,

=++…+(8-6)+(4-2),

=2×500,

=1000;

(3)

1
2
×(0.875×12.4+1+4.4×
7
8
)×
4
3
-
1
4

=

2
3
×(
7
8
×12.4+1+4.4×
7
8
)-
1
4

=

2
3
×[(12.4+4.4)×
7
8
+1]-
1
4

=

2
3
×[16.8×
7
8
+1]-
1
4

=

2
3
×[14.7+1]-
1
4

=

2
3
×15.7-
1
4

=

2
3
×(15+
7
10
)-
1
4

=10+

7
15
-
1
4

=10

13
60

(4)[1-(

1
12+
1
2
+
1
10
)×2
1
2
11
25

=[1-(

1
25
2
+
1
10
)×2
1
2
11
25

=[1-(

2
25
+
1
10
)×2
1
2
11
25

=[1-

9
50
×
5
2
11
25

=[1-

9
20
25
11

=

11
20
×
25
11

=

5
4

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