题目内容
| 解方程 7×(4.5-x)=17.5 |
| 5÷(x-0.5)=25% |
(1)7×(4.5-x)=17.5,
7×4.5-7x=17.5,
31.5-7x=17.5,
31.5-7x+7x=17.5+7x,
17.5+7x=31.5,
17.5+7x-17.5=31.5-17.5,
7x=14,
7x÷7=14÷7,
x=2;
(2)
-
=
,
(
-
)x=
,
x=
,
x×6=
×6,
x=
;
(3)5÷(x-0.5)=25%,
5÷(x-0.5)×(x-0.5)=0.25×(x-0.5),
0.25x-0.125=5,
0.25x-0.125+0.125=5+0.125,
0.25x=5.125,
0.25x÷0.25=5.125÷0.25,
x=20.5.
7×4.5-7x=17.5,
31.5-7x=17.5,
31.5-7x+7x=17.5+7x,
17.5+7x=31.5,
17.5+7x-17.5=31.5-17.5,
7x=14,
7x÷7=14÷7,
x=2;
(2)
| x |
| 2 |
| x |
| 3 |
| 6 |
| 5 |
(
| 1 |
| 2 |
| 1 |
| 3 |
| 6 |
| 5 |
| 1 |
| 6 |
| 6 |
| 5 |
| 1 |
| 6 |
| 6 |
| 5 |
x=
| 36 |
| 5 |
(3)5÷(x-0.5)=25%,
5÷(x-0.5)×(x-0.5)=0.25×(x-0.5),
0.25x-0.125=5,
0.25x-0.125+0.125=5+0.125,
0.25x=5.125,
0.25x÷0.25=5.125÷0.25,
x=20.5.
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