题目内容
1÷2x=
-
x=
x÷
=
x-
x=15
x×20%=20
x÷
×
=
.
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x-
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x×20%=20
x÷
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(1)1÷2x=
,
1÷2x×2x=
×2x,
x=1;
(2)
-
x=
,
-
x+
x=
+
x,
x+
=
,
x+
-
=
-
,
x=
,
x÷
=
÷
,
x=
×
,
x=
;
(3)
x÷
=
,
x÷
×
=
×
,
x=1,
x÷
=1÷
,
x=
;
(4)x-
x=15,
(1-
)x=15,
x=15,
x÷
=15÷
,
x=15×
,
x=40;
(5)x×20%=20,
0.2x=20,
0.2x÷0.2=20÷0.2,
x=100;
(6)x÷
×
=
,
x×
×
=
,
x×
=
,
x×
÷
=
÷
,
x=1.
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| 2 |
1÷2x×2x=
| 1 |
| 2 |
x=1;
(2)
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x=
| 5 |
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x=
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(3)
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| 5 |
x=
| 5 |
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(4)x-
| 5 |
| 8 |
(1-
| 5 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
x=15×
| 8 |
| 3 |
x=40;
(5)x×20%=20,
0.2x=20,
0.2x÷0.2=20÷0.2,
x=100;
(6)x÷
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| 7 |
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| 14 |
| 3 |
| 4 |
x×
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| 6 |
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| 3 |
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x×
| 3 |
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| 3 |
| 4 |
x×
| 3 |
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| 3 |
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| 3 |
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x=1.
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