题目内容
解方程.
80%x-0.2=3x+
x=
=
.
80%x-0.2=3x+
| 1 |
| 4 |
| 1 |
| 5 |
| x |
| 0.8 |
| 1.5 |
| 4 |
(1)80%x-0.2=3,
80%x-0.2+0.2=3+0.2,
0.8x÷0.8=3.2÷0.8,
x=4;
(2)x+
x=
,
x=
,
x×
=
×
,
x=
;
(3)
=
,
4x=0.8×1.5,
4x÷4=1.2÷4,
x=0.3.
80%x-0.2+0.2=3+0.2,
0.8x÷0.8=3.2÷0.8,
x=4;
(2)x+
| 1 |
| 4 |
| 1 |
| 5 |
| 5 |
| 4 |
| 1 |
| 5 |
| 5 |
| 4 |
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
x=
| 4 |
| 25 |
(3)
| x |
| 0.8 |
| 1.5 |
| 4 |
4x=0.8×1.5,
4x÷4=1.2÷4,
x=0.3.
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