题目内容
解方程:
(1)48÷
-0.4x=4;
(2)0.5x+2x=11
;
(3)
-
x=
.
(1)48÷
| 1 |
| 3 |
(2)0.5x+2x=11
| 1 |
| 5 |
(3)
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| 9 |
| 1 |
| 9 |
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| 6 |
(1)48÷
-0.4x=4
144-0.4x+0.4x=4+0.4x
4+0.4x=144
4+0.4x-4=144-4
0.4x÷0.4=140÷0.4
x=350
(2)0.5x+2x=11
2.5x÷2.5=11.2÷2.5
x=4.48
(3)
-
x=
-
x+
x=
+
x
+
x=
+
x-
=
-
x÷
=
÷
x=6.5.
| 1 |
| 3 |
144-0.4x+0.4x=4+0.4x
4+0.4x=144
4+0.4x-4=144-4
0.4x÷0.4=140÷0.4
x=350
(2)0.5x+2x=11
| 1 |
| 5 |
2.5x÷2.5=11.2÷2.5
x=4.48
(3)
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x=6.5.
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