问题 解答题
1-[1-(
5
7
+
3
14
÷
3
4
)]×
2
7
9
32
÷[
3
4
-(
5
16
+
1
4
)]
[5.7-4.8×(480%-3.8)]÷0.45
987×655-321
666+987×654
+4
1
2
÷
1
4
1
2004
+
2
2004
+
3
2004
+…+
100
2004
(1+
5
99
+3
5
33
+9
5
11
)÷(1
1
99
+3
1
33
+9
1
11
)
答案

(1)1-[1-(

5
7
+
3
14
÷
3
4
)]×
2
7

=1-[1-(

5
7
+
2
7
)]×
2
7

=1-[1-1]×

2
7

=1-0×

2
7

=1-0,

=1;

(2)

9
32
÷[
3
4
-(
5
16
+
1
4
)],

=

9
32
÷[
3
4
-
9
16
],

=

9
32
÷
3
16

=

3
2

(3)[5.7-4.8×(480%-3.8)]÷0.45,

=[5.7-4.8×1]÷0.45,

=[5.7-4.8]÷0.45,

=0.9÷0.45,

=2;

(4)

987×655-321
666+987×654
+4
1
2
÷
1
4

=

987×(654+1)-321
666+987×654
+4
1
2
÷
1
4

=

987×654+987-321
666+987×654
+4
1
2
÷
1
4

=

987×654+666
666+987×654
+4
1
2
÷
1
4

=1+4

1
2
÷
1
4

=1+18,

=19;

(5)

1
2004
+
2
2004
+
3
2004
+…+
100
2004

=

1+2+3+…100
2004

=

(1+100)×50
2004

=

5050
2004

=

2525
1002

(6)(1+

5
99
+3
5
33
+9
5
11
)÷(1
1
99
+3
1
33
+9
1
11
),

=[(1+3+9)+(

5
99
+
5
33
+
5
11
)]÷[(1+3+9)+(
1
99
+
1
33
+
1
11
),

=[13+

65
99
]÷[13+
13
99
],

=[13×(1+

5
99
)]÷[13×(1+
1
99
)],

=(1+

5
99
)÷(1+
1
99
),

=

104
99
÷
100
99

=

26
25

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