题目内容
解方程
| х÷4.5=20 | х+
| х-(
| 2.7х-1.6х=22. |
(1)х÷4.5=20,
х÷4.5×4.5=20×4.5,
х=90;
(2)х+
=
,
х+
-
=
-
,
х=
;
(3)х-(
-
)=
,
х-
+
=
+
,
х=
;
(4)2.7х-1.6х=22,
1.1х=22,
1.1х÷1.1=22÷1.1,
х=20.
х÷4.5×4.5=20×4.5,
х=90;
(2)х+
| 3 |
| 10 |
| 11 |
| 20 |
х+
| 3 |
| 10 |
| 3 |
| 10 |
| 11 |
| 20 |
| 3 |
| 10 |
х=
| 1 |
| 4 |
(3)х-(
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 20 |
х-
| 7 |
| 15 |
| 7 |
| 15 |
| 3 |
| 20 |
| 7 |
| 15 |
х=
| 37 |
| 60 |
(4)2.7х-1.6х=22,
1.1х=22,
1.1х÷1.1=22÷1.1,
х=20.
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