题目内容
解方程
:
=X:
8χ-7×2.3=32.9
5×70%+0.4X=9.1.
| 3 |
| 7 |
| 1 |
| 3 |
| 7 |
| 12 |
8χ-7×2.3=32.9
5×70%+0.4X=9.1.
(1)
:
=x:
,
x=
×
,
x×3=
×3,
x=
;
(2)8χ-7×2.3=32.9,
8x-16.1=32.9,
8x-16.1+16.1=32.9+16.1,
8x=49,
x=
;
(3)5×70%+0.4X=9.1,
3.5+0.4x=9.1,
3.5+0.4x-3.5=9.1-3.5,
0.4x=5.6,
0.4x÷0.4=5.6÷0.4,
x=14.
| 3 |
| 7 |
| 1 |
| 3 |
| 7 |
| 12 |
| 1 |
| 3 |
| 3 |
| 7 |
| 7 |
| 12 |
| 1 |
| 3 |
| 1 |
| 4 |
x=
| 3 |
| 4 |
(2)8χ-7×2.3=32.9,
8x-16.1=32.9,
8x-16.1+16.1=32.9+16.1,
8x=49,
x=
| 49 |
| 8 |
(3)5×70%+0.4X=9.1,
3.5+0.4x=9.1,
3.5+0.4x-3.5=9.1-3.5,
0.4x=5.6,
0.4x÷0.4=5.6÷0.4,
x=14.
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