题目内容
求未知数x:
(1)
X+
×
=
(2)75%X-
X=
(3)X:1.25=0.4:
.
(1)
| 5 |
| 6 |
| 4 |
| 9 |
| 3 |
| 8 |
| 16 |
| 9 |
(2)75%X-
| 2 |
| 7 |
| 39 |
| 4 |
(3)X:1.25=0.4:
| 3 |
| 2 |
(1)
X+
×
=
,
X+
=
,
X+
-
=
-
,
X=
,
X×
=
×
,
X=
;
(2)75%X-
X=
,
(
-
)X=
,
X=
,
X×
=
×
,
X=21;
(3)X:1.25=0.4:
,
X=1.25×0.4,
1.5X=0.5,
1.5X÷1.5=0.5÷1.5,
X=
.
| 5 |
| 6 |
| 4 |
| 9 |
| 3 |
| 8 |
| 16 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
| 16 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 6 |
| 16 |
| 9 |
| 1 |
| 6 |
| 5 |
| 6 |
| 29 |
| 18 |
| 5 |
| 6 |
| 6 |
| 5 |
| 29 |
| 18 |
| 6 |
| 5 |
X=
| 29 |
| 15 |
(2)75%X-
| 2 |
| 7 |
| 39 |
| 4 |
(
| 3 |
| 4 |
| 2 |
| 7 |
| 39 |
| 4 |
| 13 |
| 28 |
| 39 |
| 4 |
| 13 |
| 28 |
| 28 |
| 13 |
| 39 |
| 4 |
| 28 |
| 13 |
X=21;
(3)X:1.25=0.4:
| 3 |
| 2 |
| 3 |
| 2 |
1.5X=0.5,
1.5X÷1.5=0.5÷1.5,
X=
| 1 |
| 3 |
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