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求下列各题的未知数x.3x−25×34=9560÷(x+10)=538(28-2x)=6(x-5)
题目详情
求下列各题的未知数x.
3x−
×
=
60÷(x+10)=5
(28-2x)=6(x-5)
3x−
×
=
60÷(x+10)=5
(28-2x)=6(x-5)
2 2 5 5
3 3 4 4
9 9 5 5
(28-2x)=6(x-5)
3 3 8 8
3x−
2 |
5 |
3 |
4 |
9 |
5 |
60÷(x+10)=5
3 |
8 |
3x−
2 |
5 |
3 |
4 |
9 |
5 |
60÷(x+10)=5
3 |
8 |
2 |
5 |
3 |
4 |
9 |
5 |
3 |
8 |
3 |
8 |
▼优质解答
答案和解析
①3x−
×
=
3x-
=
3x-
+
=
+
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6 3x−
2 2 25 5 5×
3 3 34 4 4=
9 9 95 5 5
3x-
=
3x-
+
=
+
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
3 3 310 10 10=
3x-
+
=
+
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
9 9 95 5 5
3x-
+
=
+
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
3 3 310 10 10+
=
+
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
3 3 310 10 10=
+
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
9 9 95 5 5+
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
3 3 310 10 10
3x=
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
21 21 2110 10 10
3x×
=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
1 1 13 3 3=
×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
21 21 2110 10 10×
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
1 1 13 3 3
x=
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
7 7 710 10 10
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
3 3 38 8 8(28-2x)=6(x-5)
-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
21 21 212 2 2-
x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
3 3 34 4 4x=6x-30
+30=6x+
x
x=
x×
=
×
x=6
21 21 212 2 2+30=6x+
x
x=
x×
=
×
x=6
3 3 34 4 4x
x=
x×
=
×
x=6
27 27 274 4 4x=
x×
=
×
x=6
81 81 812 2 2
x×
=
×
x=6
27 27 274 4 4x×
=
×
x=6
4 4 427 27 27=
×
x=6
81 81 812 2 2×
x=6
4 4 427 27 27
x=6
①3x−
2 |
5 |
3 |
4 |
9 |
5 |
3x-
3 |
10 |
9 |
5 |
3x-
3 |
10 |
3 |
10 |
9 |
5 |
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6 3x−
2 |
5 |
3 |
4 |
9 |
5 |
3x-
3 |
10 |
9 |
5 |
3x-
3 |
10 |
3 |
10 |
9 |
5 |
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
3 |
10 |
9 |
5 |
3x-
3 |
10 |
3 |
10 |
9 |
5 |
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
9 |
5 |
3x-
3 |
10 |
3 |
10 |
9 |
5 |
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
3 |
10 |
3 |
10 |
9 |
5 |
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
3 |
10 |
9 |
5 |
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
9 |
5 |
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
3 |
10 |
3x=
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
21 |
10 |
3x×
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
1 |
3 |
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
21 |
10 |
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
1 |
3 |
x=
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
7 |
10 |
②60÷(x+10)=5
60÷(x+10)×(x+10)=5 (x+10)
5x+50=60
5x+50-50=60-50
5x=10
5x÷5=10÷5
x=2
③
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
3 |
8 |
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
21 |
2 |
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
3 |
4 |
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
21 |
2 |
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
3 |
4 |
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
27 |
4 |
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
81 |
2 |
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
27 |
4 |
4 |
27 |
81 |
2 |
4 |
27 |
x=6
4 |
27 |
81 |
2 |
4 |
27 |
x=6
81 |
2 |
4 |
27 |
x=6
4 |
27 |
x=6
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