问题 解答题
求未知数X.
X:
2
7
=6:5                                  
10
x
=
4.5
0.9
答案

(1)x:

2
7
=6:5,

            5x=6×

2
7

            5x=

12
7

         5x÷5=

12
7
÷5,

             x=

12
35

(2)

10
x
=
4.5
0.9

    4.5x=10×0.9,

    4.5x=9,

4.5x÷4.5=9÷4.5,

        x=2.

单项选择题
单项选择题