题目内容
求未知数x.
| 3.2x-4×3=52 |
| 5x-2x=12 |
根据题意可得:
(1)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;
(2)
:x=
:
,
x=
×
,
x=
,
x÷
=
÷
,
x=
;
(3)5x-2x=12,
3x=12,
3x÷3=12÷3,
x=4.
(1)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;
(2)
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
x=
| 1 |
| 5 |
(3)5x-2x=12,
3x=12,
3x÷3=12÷3,
x=4.
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