题目内容
解方程.
40%x+x=37.8
8x-9=9.4
x:
=
:
.
40%x+x=37.8
8x-9=9.4
x:
| 2 |
| 5 |
| 6 |
| 7 |
| 3 |
| 10 |
(1)40%x+x=37.8,
(40%+1)x=37.8,
1.4x=37.8,
1.4x÷1.4=37.8÷1.4,
x=27;
(2)8x-9=9.4,
8x-9+9=9.4+9,
8x=18.4,
8x÷8=18.4÷8,
x=2.3;
(3)x:
=
:
,
x=
×
,
x×
=
×
,
x=
.
(40%+1)x=37.8,
1.4x=37.8,
1.4x÷1.4=37.8÷1.4,
x=27;
(2)8x-9=9.4,
8x-9+9=9.4+9,
8x=18.4,
8x÷8=18.4÷8,
x=2.3;
(3)x:
| 2 |
| 5 |
| 6 |
| 7 |
| 3 |
| 10 |
| 3 |
| 10 |
| 2 |
| 5 |
| 6 |
| 7 |
| 3 |
| 10 |
| 10 |
| 3 |
| 12 |
| 35 |
| 10 |
| 3 |
x=
| 8 |
| 7 |
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