题目内容
| 求未知数X: X+
| 80×
|
| 1-
|
(1)X+
X=7,
x=7,
x÷
=7÷
,
x=6;
(2)80×
-
X=16,
60-
x=16
60-
x+
x=16+
x,
16+
x-16=60-16,
x=44,
x÷
=44÷
,
x=176;
(3)
:x=
:6,
x×
=
×6,
x×
=
,
x×
÷
=
÷
,
x=5;
(4)1-
x=
,
1-
x+
x=
+
x,
+
x=1,
+
x-
=1-
,
x=
,
x÷
=
÷
,
x=1.
| 1 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
x=6;
(2)80×
| 3 |
| 4 |
| 1 |
| 4 |
60-
| 1 |
| 4 |
60-
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
16+
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
x=176;
(3)
| 5 |
| 8 |
| 3 |
| 4 |
x×
| 3 |
| 4 |
| 5 |
| 8 |
x×
| 3 |
| 4 |
| 15 |
| 4 |
x×
| 3 |
| 4 |
| 3 |
| 4 |
| 15 |
| 4 |
| 3 |
| 4 |
x=5;
(4)1-
| 1 |
| 4 |
| 3 |
| 4 |
1-
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
x=1.
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