题目内容
求未知数.
(1)
x+
x=
(2)
=
(3)4x+3×0.7=6.5.
(1)
| 1 |
| 3 |
| 2 |
| 5 |
| 4 |
| 15 |
(2)
| 0.25 |
| x |
| 1.25 |
| 3 |
(3)4x+3×0.7=6.5.
(1)
x+
x=
x×
=
×
,
x=
;
(2)
=
1.25x=0.25×3,
1.25x÷1.25=0.25×3÷1.25,
x=0.6;
(3)4x+3×0.7=6.5
4x+2.1=6.5,
4x+2.1-2.1=6.5-2.1,
4x÷4=4.4÷4,
x=1.1.
| 1 |
| 3 |
| 2 |
| 5 |
| 4 |
| 15 |
| 11 |
| 15 |
| 15 |
| 11 |
| 4 |
| 15 |
| 15 |
| 11 |
x=
| 4 |
| 11 |
(2)
| 0.25 |
| x |
| 1.25 |
| 3 |
1.25x=0.25×3,
1.25x÷1.25=0.25×3÷1.25,
x=0.6;
(3)4x+3×0.7=6.5
4x+2.1=6.5,
4x+2.1-2.1=6.5-2.1,
4x÷4=4.4÷4,
x=1.1.
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