题目内容

计算
(1)3.6-2.75+0.4-0.25
(2)0.75×
5
6
+
3
4
×
1
6

(3)2-
6
13
÷
9
26
-
2
3

(4)2x-
3
2
x=
4
5

(5)
1
2
(2x-1)=
3
2
(1)3.6-2.75+0.4-0.25,
=3.6+0.4-(2.75+0.25),
=4-3,
=1;

(2)0.75×
5
6
+
3
4
×
1
6

=0.75×(
5
6
+
1
6
),
=0.75×1,
=0.75;

(3)2-
6
13
÷
9
26
-
2
3

=2-
6
13
×
26
9
-
2
3

=2-(
4
3
+
2
3
),
=2-2,
=0;

(4)2x-
3
2
x=
4
5

1
2
x=
4
5

1
2
x×2=
4
5
×
2,
x=1
3
5


(5)
1
2
(2x-1)=
3
2

x-
1
2
=
3
2

x-
1
2
+
1
2
=
3
2
+
1
2

x=2.
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