题目内容
计算：
（1）1-
÷
；
（2）
：
=
：x；
（3）[0.75-1÷（
+
）]×
；
（4）解方程x÷
=
÷
．
（1）1-
| 7 |
| 9 |
| 21 |
| 8 |
（2）
| 1 |
| 12 |
| 1 |
| 15 |
| 1 |
| 4 |
（3）[0.75-1÷（
| 1 |
| 7 |
| 19 |
| 14 |
| 2 |
| 3 |
（4）解方程x÷
| 6 |
| 35 |
| 26 |
| 45 |
| 13 |
| 25 |
（1）1-
÷
=1-
=
；
（2）
：
=
：x
x=
×
x÷
=
÷
x=
；
（3）[0.75-1÷（
+
）]×
=（0.75-1÷
）×
=（0.75-
）×
=
×
=
；
（4）x÷
=
÷
x÷
×
=
×
x=
．
| 7 |
| 9 |
| 21 |
| 8 |
=1-
| 8 |
| 27 |
=
| 19 |
| 27 |
（2）
| 1 |
| 12 |
| 1 |
| 15 |
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 15 |
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 12 |
| 1 |
| 60 |
| 1 |
| 12 |
x=
| 1 |
| 5 |
（3）[0.75-1÷（
| 1 |
| 7 |
| 19 |
| 14 |
| 2 |
| 3 |
=（0.75-1÷
| 21 |
| 14 |
| 2 |
| 3 |
=（0.75-
| 2 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 12 |
| 2 |
| 3 |
=
| 1 |
| 18 |
（4）x÷
| 6 |
| 35 |
| 26 |
| 45 |
| 13 |
| 25 |
x÷
| 6 |
| 35 |
| 6 |
| 35 |
| 10 |
| 9 |
| 6 |
| 35 |
x=
| 4 |
| 21 |
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