题目内容
求未知数
|
| (7x+4x)÷3=
|
|
(1)
:
=χ:50,
x=
×50,
x×5=15×5,
x=75;
(2)
:2.5=
,
x=2.5×6,
x×
=15×
,
x=25;
(3)(7x+4x)÷3=
,
11x÷3=
,
x=
,
x×
=
×
,
x=
;
(4)
×5-
x=
,
-
x=
,
-
x+
x=
+
x,
+
x-
=
-
,
x×
=
×
,
x=1
.
| 3 |
| 10 |
| 1 |
| 5 |
| 1 |
| 5 |
| 3 |
| 10 |
| 1 |
| 5 |
x=75;
(2)
| 3 |
| 5 |
| 6 |
| x |
| 3 |
| 5 |
| 3 |
| 5 |
| 5 |
| 3 |
| 5 |
| 3 |
x=25;
(3)(7x+4x)÷3=
| 33 |
| 10 |
11x÷3=
| 33 |
| 10 |
| 11 |
| 3 |
| 33 |
| 10 |
| 11 |
| 3 |
| 3 |
| 11 |
| 33 |
| 10 |
| 3 |
| 11 |
x=
| 9 |
| 10 |
(4)
| 9 |
| 25 |
| 3 |
| 4 |
| 3 |
| 5 |
| 9 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 9 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 9 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
| 4 |
| 3 |
| 6 |
| 5 |
| 4 |
| 3 |
x=1
| 3 |
| 5 |
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