题目内容
求未知数X:
1-
X=
X-
X=
1.25:0.25=
.
1-
| 3 |
| 4 |
| 3 |
| 5 |
X-
| 1 |
| 4 |
| 3 |
| 8 |
1.25:0.25=
| X |
| 1.6 |
(1)1-
X=
,
X=1-
,
X=
,
X=
÷
,
X=
×
,
X=
;
(2)X-
X=
,
X=
,
X=
÷
,
X=
×
,
X=
;
(3)1.25:0.25=
,
0.25X=1.25×1.6,
0.25X=2,
X=2÷0.25,
X=8.
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
X=
| 2 |
| 5 |
| 3 |
| 4 |
X=
| 2 |
| 5 |
| 4 |
| 3 |
X=
| 8 |
| 15 |
(2)X-
| 1 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
X=
| 3 |
| 8 |
| 3 |
| 4 |
X=
| 3 |
| 8 |
| 4 |
| 3 |
X=
| 1 |
| 2 |
(3)1.25:0.25=
| X |
| 1.6 |
0.25X=1.25×1.6,
0.25X=2,
X=2÷0.25,
X=8.
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