题目内容

脱式计算
①9028-(4028+523)-477  
②8
7
8
-[8-(2.125-0.125÷
1
8
)]
③3
1
8
÷[(4
5
12
-3
13
24
)×
4
7
+(3
1
18
-2
7
12
)×1
10
17
]
④(1-
1
2×2
)(1-
1
3×3
)(1-
1
4×4
)…(1-
1
2001×2001
(1)9028-(4028+523)-477
=(9028-4028)-(523+477),
=5000-1000,
=4000;

(2)8
7
8
-[8-(2.125-0.125÷
1
8
)]
=8
7
8
-
[8-(2
1
8
-
1
8
÷
1
8
)],
=8
7
8
-
[8-(2
1
8
-1)],
=8
7
8
-
[8-1
1
8
],
=8
7
8
+1
1
8
-8,
=10-8
=2;

(3)3
1
8
÷[(4
5
12
-3
13
24
)×
4
7
+(3
1
18
-2
7
12
)×1
10
17
]
=
25
8
÷[(
53
12
-
85
24
)×
4
7
+(
55
18
-
31
12
)×
27
17
],
=
25
8
÷[
21
24
×
4
7
+
17
36
×
27
17
],
=
25
8
÷[
1
2
+
3
4
],
=
25
8
×
4
5

=
5
2


(4)(1-
1
2×2
)(1-
1
3×3
)(1-
1
4×4
)…(1-
1
2001×2001

=
1×3
2×2
×
2×4
3×3
×
3×5
4×4
×…×
1999×2001
2000×2000
×
2000×2002
2001×2001

=
1
2
×
2002
2001

=
1001
2001
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