问题 解答题
解方程.
1÷﹙x÷
3
5
-
3
4
×
2
3
﹚=
3
8
80%x-30+10=
3
4
﹙x-10﹚
3
4
x
+8=33-
2
3
﹙x-5﹚
答案

(1)1÷﹙x÷

3
5
-
3
4
×
2
3
﹚=
3
8

1÷﹙x×

5
3
-
1
2
﹚=
3
8

5
3
x-
1
2
=1÷
3
8

5
3
x-
1
2
=
8
3

5
3
x-
1
2
+
1
2
=
16
6
+
3
6

5
3
3
5
=
19
6
×
3
5

x=1.9;

(2)80%x-30+10=

3
4
(x-10),

0.8x-30+10=0.75x-7.5,

0.8x-0.75x+30-30+10-10=0.75x-0.75x+30-10-7.5,

0.05x=12.5,

0.05x÷0.05=12.5÷0.05,

x=250;

(3)

3
4
x+8=33-
2
3
﹙x-5﹚,

3
4
x+8=33-
2
3
x+
2
3
×5,

9
12
x+8=33-
8
12
x+
10
3

9
12
x+
8
12
x+8=33+
8
12
x-
8
12
x+
10
3

17
12
x+8-8=33-8+
10
3

17
12
x=
75
3
+
10
3

17
12
12
17
=
85
3
×
12
17

x=20.

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