题目内容

灵活计算下面各题.
2-2÷3-
1
3
25×2.5×32
12
5
×(
5
6
+
1
2
)+0.8
5.02-1.37-2.6320%+
4
7
+80%-
4
7
8
13
÷7+
1
7
×
5
13
(1)2-2÷3-
1
3

=2-
2
3
-
1
3

=2-(
2
3
+
1
3
),
=2-1,
=1;

(2)25×2.5×32,
=25×2.5×4×4×2,
=(25×4)×(2.5×4)×2,
=100×10×2,
=1000×2,
=2000;

(3)
12
5
×(
5
6
+
1
2
)+0.8,
=
12
5
×
5
6
+
12
5
×
1
2
+0.8,
=2+
6
5
+
4
5

=2+(
6
5
+
4
5
),
=2+2,
=4;

(4)5.02-1.37-2.63,
=5.02-(1.37+2.63),
=5.02-4,
=1.02;

(5)20%+
4
7
+80%-
4
7

=(20%+80%)+(
4
7
-
4
7
),
=1+0,
=1;

(6)
8
13
÷7+
1
7
×
5
13

=
8
13
×
1
7
+
1
7
×
5
13

=
1
7
×(
8
13
+
5
13
),
=
1
7
×1,
=
1
7
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