问题 解答题
解方程或比例.
3.6
4
=
x
5

1
2
x-1.5=11.5
3
4
x-(1-80%)x=4.95.
答案

(1)

3.6
4
=
x
5

            4x=5×3.6,

            4x=18,

             x=4.5;

(2)

1
2
x-1.5=11.5,

         

1
2
x=11.5-1.5,

         

1
2
x=10,

            x=20;

(3)

3
4
x-(1-80%)x=4.95,

          

3
4
x-20%x=4.95,

            

3
4
x-
1
5
x=4.95,

               

11
20
x=4.95,

                  x=9;

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