题目内容
解方程或解比例.
50%x-30=52
x-
x=
=
:x=
:
.
50%x-30=52
x-
| 4 |
| 9 |
| 10 |
| 21 |
| 28 |
| x |
| 0.4 |
| 0.1 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
(1)50%x-30=52,
50%x-30+30=52+30,
50%x=82,
50%x÷50%=82÷50%,
x=164;
(2)x-
x=
,
x=
,
x÷
=
÷
,
x=
;
(3)
=
,
0.4x=28×0.1,
0.4x÷0.4=2.8÷0.4,
x=7;
(4)
:x=
:
,
x=
×
x÷
=
÷
,
x=
.
50%x-30+30=52+30,
50%x=82,
50%x÷50%=82÷50%,
x=164;
(2)x-
| 4 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
x=
| 6 |
| 7 |
(3)
| 28 |
| x |
| 0.4 |
| 0.1 |
0.4x=28×0.1,
0.4x÷0.4=2.8÷0.4,
x=7;
(4)
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
x=
| 1 |
| 5 |
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