题目内容
解方程
7.2-2χ=3.8
χ=18
χ÷14=
.
7.2-2χ=3.8
| 3 |
| 4 |
| 7 |
| 4 |
| 1 |
| 2 |
(1)7.2-2x=3.8,
7.2-2x+2x=3.8+2x,
3.8+2x=7.2,
3.8+2x-3.8=7.2-3.8,
2x=3.4,
2x÷2=3.4÷2,
x=1.7;
(2)
x=18,
x×
=18×
,
x=24;
(3)
x÷14=
,
x÷14×14=
×14,
x=7,
x×
=7×
,
x=4.
7.2-2x+2x=3.8+2x,
3.8+2x=7.2,
3.8+2x-3.8=7.2-3.8,
2x=3.4,
2x÷2=3.4÷2,
x=1.7;
(2)
| 3 |
| 4 |
| 3 |
| 4 |
| 4 |
| 3 |
| 4 |
| 3 |
x=24;
(3)
| 7 |
| 4 |
| 1 |
| 2 |
| 7 |
| 4 |
| 1 |
| 2 |
| 7 |
| 4 |
| 7 |
| 4 |
| 4 |
| 7 |
| 4 |
| 7 |
x=4.
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