题目内容
解方程
(1)2x-1
+2.35=9
(2)x:
=0.3x+12.
(1)2x-1
| 13 |
| 20 |
(2)x:
| 7 |
| 10 |
(1)2x-1
+2.35=9,
2x+0.7=9,
2x+0.7-0.7=9-0.7,
2x=8.3,
2x÷2=8.3÷2,
x=4.15;
(2)x:
=0.3x+12.
x×
=0.3x+12,
x=
x+12,
x-
x=
x-
x+12,
x=12,
x×
=12×
,
x=
,
x=10
.
| 13 |
| 20 |
2x+0.7=9,
2x+0.7-0.7=9-0.7,
2x=8.3,
2x÷2=8.3÷2,
x=4.15;
(2)x:
| 7 |
| 10 |
x×
| 10 |
| 7 |
| 10 |
| 7 |
| 3 |
| 10 |
| 100 |
| 70 |
| 21 |
| 70 |
| 21 |
| 70 |
| 21 |
| 70 |
| 79 |
| 70 |
| 79 |
| 70 |
| 70 |
| 79 |
| 70 |
| 79 |
x=
| 840 |
| 79 |
x=10
| 50 |
| 79 |
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