题目内容

解方程:
8
9x
=
7
12
2.4:
3
2
=3.2:x
28
3
x=
49
9
×
9
7
3
2
×3+2.75x=
19
3
5.6x-
3
5
x=4.8
5x-3×
7
10
=
7
5
(1)
8
9x
=
7
12

63x=8×12,
63x÷63=8×12÷63,
x=
32
21


(2)2.4:
3
2
=3.2:x,
2.4x=3.2×
3
2

2.4x÷2.4=3.2×
3
2
÷2.4,
x=2;

(3)
28
3
x=
49
9
×
9
7

28
3
28
3
=
49
9
×
9
7
÷
28
3

x=
3
4


(4)
3
2
×3+2.75x=
19
3

9
2
+2.75x=
19
3

9
2
+2.75x-
9
2
=
19
3
-
9
2

2.75x=
11
6

2.75x÷2.75=
11
6
÷2.75,
x=
2
3


(5)5.6x-
3
5
x=4.8

5x=4.8,
5x÷5=4.8÷5,
x=0.96;

(6)5x-3×
7
10
=
7
5

5x-
21
10
=
7
5

5x-
21
10
+
21
10
=
7
5
+
21
10

5x=
35
10

5x÷5=
35
10
÷5,
x=
7
10
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