问题 解答题
解方程.
2
15
-
1
10
)x=
2
25
7x÷
1
5
=
1
2
8
9
x-
1
3
x=
35
36
x-15%x=37.4X+
1
4
=
5
8
x÷(1-
5
9
)=
4
5
答案

(1)(

2
15
-
1
10
)x=
2
25

1
30
x÷
1
30
=
2
25
÷
1
30

x=2.4;

(2)7x÷

1
5
=
1
2

7x÷

1
5
×
1
5
=
1
2
×
1
5

7x÷7=

1
10
÷7,

x=

1
70

(3)

8
9
x-
1
3
x=
35
36

5
9
x=
35
36

5
9
x÷
5
9
=
35
36
÷
5
9

x=1.75;

(4)x-15%x=37.4,

85%x÷85%=37.4÷85%,

x=44;

(5)X+

1
4
=
5
8

X+

1
4
-
1
4
=
5
8
-
1
4

x=

3
8

(6)x÷(1-

5
9
)=
4
5

x÷

4
9
×
4
9
=
4
5
×
4
9

x=

16
45

材料题
单项选择题