题目内容
解方程
x:1.2=3:4
3.2x-4×3=52
2X-
=
.
x:1.2=3:4
3.2x-4×3=52
2X-
| 3 |
| 4 |
| 21 |
| 5 |
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;
(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;
(3)2x-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
.
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;
(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;
(3)2x-
| 3 |
| 4 |
| 21 |
| 5 |
2x-
| 3 |
| 4 |
| 3 |
| 4 |
| 21 |
| 5 |
| 3 |
| 4 |
2x=
| 99 |
| 20 |
2x÷2=
| 99 |
| 20 |
x=
| 99 |
| 40 |
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