题目内容
解方程.
1÷﹙x÷
| 80%x-30+10=
|
|
(1)1÷﹙x÷
-
×
﹚=
,
1÷﹙x×
-
﹚=
,
x-
=1÷
,
x-
=
,
x-
+
=
+
,
x×
=
×
,
x=1.9;
(2)80%x-30+10=
(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)
x+8=33-
﹙x-5﹚,
x+8=33-
x+
×5,
x+8=33-
x+
,
x+
x+8=33+
x-
x+
,
x+8-8=33-8+
,
x=
+
,
x×
=
×
,
x=20.
| 3 |
| 5 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 8 |
1÷﹙x×
| 5 |
| 3 |
| 1 |
| 2 |
| 3 |
| 8 |
| 5 |
| 3 |
| 1 |
| 2 |
| 3 |
| 8 |
| 5 |
| 3 |
| 1 |
| 2 |
| 8 |
| 3 |
| 5 |
| 3 |
| 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 |
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 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 9 |
| 12 |
| 8 |
| 12 |
| 10 |
| 3 |
| 9 |
| 12 |
| 8 |
| 12 |
| 8 |
| 12 |
| 8 |
| 12 |
| 10 |
| 3 |
| 17 |
| 12 |
| 10 |
| 3 |
| 17 |
| 12 |
| 75 |
| 3 |
| 10 |
| 3 |
| 17 |
| 12 |
| 12 |
| 17 |
| 85 |
| 3 |
| 12 |
| 17 |
x=20.
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