题目内容
解比例或方程.
1-
χ=
5χ-2χ=150
:
=χ:9
=
.
1-
| 3 |
| 4 |
| 2 |
| 5 |
5χ-2χ=150
| 2 |
| 3 |
| 6 |
| 5 |
| 8 |
| 21 |
| 0.4 |
| χ |
(1)1-
χ=
,
1-
χ+
x=
+
x,
1-
=
+
x-
,
÷
=
x÷
,
x=0.8;
(2)5χ-2χ=150,
3x÷3=150÷3,
x=50;
(3)
:
=χ:9,
x=
×9,
x÷
=6÷
,
x=5;
(4)
=
,
8x=21×0.4,
8x÷8=8.4÷8,
x=1.05.
| 3 |
| 4 |
| 2 |
| 5 |
1-
| 3 |
| 4 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
1-
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
x=0.8;
(2)5χ-2χ=150,
3x÷3=150÷3,
x=50;
(3)
| 2 |
| 3 |
| 6 |
| 5 |
| 6 |
| 5 |
| 2 |
| 3 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
x=5;
(4)
| 8 |
| 21 |
| 0.4 |
| χ |
8x=21×0.4,
8x÷8=8.4÷8,
x=1.05.
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