题目内容

1
6
+
1
9
-
1
12
)×4×9
2.5×(1.9+1.9+1.9+1.9)
3.64÷4+4.36×25% 2005
1
2003
×
2003
2004
(9
2
7
+7
2
9
)÷(
5
7
+
5
9
1
2
+
3
4
+
7
8
+
15
16
+
31
32
+
63
64
+
127
128
1
3
+
3
4
+
2
5
+
5
7
+
7
8
+
9
20
+
10
21
+
11
24
+
19
35
142857÷117+285714÷117+571428÷117.
(1)(
1
6
+
1
9
-
1
12
)×4×9
=(
1
6
+
1
9
-
1
12
)×36,
=
1
6
×36+
1
9
×36+
1
12
×36,
=6+4+3,
=13;

(2)2.5×(1.9+1.9+1.9+1.9)
=2.5×4×1.9,
=10×1.9,
=19;

(3)3.64÷4+4.36×25%
=3.64×25%+4.36×25%,
=(3.64+4.36)×25%,
=8×25%,
=2;

(4)2005
1
2003
×
2003
2004

=(2004+1
1
2003
)×
2003
2004

=2004×
2003
2004
+
2004
2003
×
2003
2004

=2003+1,
=2004;

(5)(9
2
7
+7
2
9
)÷(
5
7
+
5
9

=16
32
63
÷
80
63

=13;

(6)
1
2
+
3
4
+
7
8
+
15
16
+
31
32
+
63
64
+
127
128

=(1-
1
2
)+(1-
1
4
)+…+(1-
1
128
),
=1+1+1+1+1+1+1-(
1
2
+
1
4
+…+
1
128
),
=7-
64+32+16+8+4+2+1
128

=7-
127
128

=6
1
128


(7)
1
3
+
3
4
+
2
5
+
5
7
+
7
8
+
9
20
+
10
21
+
11
24
+
19
35

=(
1
3
++
3
4
+
7
8
+
11
24
)+(+
2
5
+
9
20
)+(
5
7
+
10
21
+
19
35
),
=
29
12
+
17
20
+
26
15

=
145
60
+
51
60
+
104
60

=5;

(8)142857÷117+285714÷117+571428÷117.
=142857×
1
117
+285714×
1
117
+571428×
1
117

=(142857+285714+571428)×
1
117

=999999×
1
117

=8547.
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