问题 解答题
求未知数
3
10
1
5
=χ:50
3
5
:2.5=
6
x
(7x+4x)÷3=
33
10
9
25
×5-
3
4
x=
3
5
答案

(1)

3
10
1
5
=χ:50,

1
5
x=
3
10
×50,

1
5
x×5=15×5,

x=75;

(2)

3
5
:2.5=
6
x

3
5
x=2.5×6,

3
5
5
3
=15×
5
3

x=25;

(3)(7x+4x)÷3=

33
10

11x÷3=

33
10

11
3
x=
33
10

11
3
3
11
=
33
10
×
3
11

x=

9
10

(4)

9
25
×5-
3
4
x=
3
5

9
5
-
3
4
x
=
3
5

9
5
-
3
4
x+
3
4
x=
3
5
+
3
4
x,

3
5
+
3
4
x-
3
5
=
9
5
-
3
5

3
4
4
3
=
6
5
×
4
3

x=1

3
5

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