题目内容
解方程.
X×
=
4X÷
=45
X+
=
50%X=4.
X×
| 5 |
| 7 |
| 5 |
| 14 |
| 2 |
| 9 |
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 8 |
(1)X×
=
,
X×
÷
=
÷
,
X=
×
,
X=
;
(2)4X÷
=45,
4X÷
×
=45×
,
4X=10,
4X÷4=10÷4,
X=2.5;
(3)
X+
=
,
X+
-
=
-
,
X=
,
X×2=
×2,
X=
;
(4)50%X=4,
0.5x=4,
0.5x÷0.5=4÷0.5,
x=8.
| 5 |
| 7 |
| 5 |
| 14 |
X×
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 14 |
| 5 |
| 7 |
X=
| 5 |
| 14 |
| 7 |
| 5 |
X=
| 1 |
| 2 |
(2)4X÷
| 2 |
| 9 |
4X÷
| 2 |
| 9 |
| 2 |
| 9 |
| 2 |
| 9 |
4X=10,
4X÷4=10÷4,
X=2.5;
(3)
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 8 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 6 |
| 3 |
| 8 |
| 1 |
| 6 |
| 1 |
| 2 |
| 5 |
| 24 |
| 1 |
| 2 |
| 5 |
| 24 |
X=
| 5 |
| 12 |
(4)50%X=4,
0.5x=4,
0.5x÷0.5=4÷0.5,
x=8.
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