问题 解答题
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
答案

(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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