问题 解答题
求未知数X.
1
4
÷
1
8
=X÷
1
10

20X=15×
4
3

X:12=0.9:3.6
3X+
1
4
X=
13
16
答案

(1)

1
4
÷
1
8
=X÷
1
10

2=X÷

1
10

1
10
=x÷
1
10
×
1
10

x=

1
5

(2)20X=15×

4
3

20x=20,

20x÷20=20÷20,

x=1;

(3)X:12=0.9:3.6,

3.6x=12×0.9,

3.6x÷3.6=10.8÷3.6,

x=3;

(4)3X+

1
4
X=
13
16

13
4
x=
13
16

13
4
x÷
13
4
=
13
16
÷
13
4

x=

1
4

解答题
单项选择题