题目内容

计算下面各题.(能简算的要简算)
3-
2
5
+4-
3
5
920÷40+1.1×500
4
7
÷9+
5
7
×
1
9
5
6
+
1
12
-
3
8
)÷
1
24
8×4×12.5×2.52003×
2001
2002
(1)3-
2
5
+4-
3
5

=(3+4)-(
2
5
+
3
5
),
=7-1,
=6;

(2)920÷40+1.1×500,
=23+550,
=573;

(3)
4
7
÷9+
5
7
×
1
9

=
4
7
×
1
9
+
5
7
×
1
9

=(
4
7
+
5
7
)×
1
9

=
9
7
×
1
9

=
1
7


(4)(
5
6
+
1
12
-
3
8
)÷
1
24

=(
5
6
+
1
12
-
3
8
)×24,
=
5
6
×24+
1
12
×24-
3
8
×24,
=20+2-9,
=13;

(5)8×4×12.5×2.5,
=(8×12.5)×(4×2.5),
=100×10,
=1000;

(6)2003×
2001
2002

=(2002+1)×
2001
2002

=2002×
2001
2002
+1×
2001
2002

=2001+
2001
2002

=2001
2001
2002
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