试题与答案

解方程.821Χ=41523Χ÷14=12Χ÷635=2645÷1325Χ+14

题型:解答题

题目:

解方程.
8
21
Χ=
4
15

2
3
Χ÷
1
4
=12

Χ÷
6
35
=
26
45
÷
13
25

Χ+
1
4
Χ=25

答案:

(1)

8
21
Χ=
4
15

8
21
21
8
=
4
15
×
21
8

X=

7
10

(2)

2
3
Χ÷
1
4
=12

8
3
X=12

8
3
3
8
=12×
3
8

X=

9
2

(3)Χ÷

6
35
=
26
45
÷
13
25

35
6
=
26
45
×
25
13

35
6
6
35
=
10
9
×
6
35

X=

4
21

(4)X+

1
4
X=25

5
4
X=25

5
4
4
5
=25×
4
5

X=20.

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