题目内容
解方程
:
=
:x
8.4+40%x=12
8x+6x=7×12
x-1=
.
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| 3 |
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| 9 |
8.4+40%x=12
8x+6x=7×12
| 3 |
| 4 |
| 1 |
| 2 |
(1)
:
=
:x
x=
×
,
x×3=
×3,
x=
;
(2)8.4+40%x=12,
8.4+0.4x-8.4=12-8.4,
0.4x÷0.4=3.6÷0.4,
x=9;
(3)8x+6x=7×12
14x=84,
14x÷14=84÷14,
x=6;
(4)
x-1=
,
x-1+1=
+1,
x×
=
×
,
x=2.
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| 9 |
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| 7 |
| 9 |
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| 7 |
| 180 |
x=
| 7 |
| 60 |
(2)8.4+40%x=12,
8.4+0.4x-8.4=12-8.4,
0.4x÷0.4=3.6÷0.4,
x=9;
(3)8x+6x=7×12
14x=84,
14x÷14=84÷14,
x=6;
(4)
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| 3 |
x=2.
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