问题 解答题
解方程:
(1)(
1
3
-
1
13
)×6-7÷13
(2)59÷[1÷(
1
10
-9%)]
(3)
3
4
x-
4
5
+0.2=
1
2
答案

(1)(

1
3
-
1
13
)×6-7÷13,

=

1
3
×6-
1
13
×6-7÷13,

=2-

6
13
-
7
13

=2-(

6
13
+
7
13
),

=2-1,

=1;

(2)59÷[1÷(

1
10
-9%)],

=59÷[1÷(10%-9%)],

=59÷[1÷1%],

=59÷100,

=0.59;

(3)

3
4
x-
4
5
+0.2=
1
2

3
4
x-
4
5
+
1
5
=
1
2

3
4
x-
3
5
=
1
2

3
4
x=
11
10

x=

11
10
÷
3
4

x=

22
15

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