问题 解答题
求未知数x.
1
2
1
5
=
1
4
:x
x
4
=
3.5
1.5
120×40%+120×
9
20
+x=120.
答案

(1)

1
2
1
5
=
1
4
:x,

           

1
2
x=
1
5
×
1
4

       

1
2
x÷
1
2
=
1
20
÷
1
2

              x=

1
10

(2 )

x
4
=
3.5
1.5

     1.5x=4×3.5,

1.5x÷1.5=13.5÷1.5,

        x=9;

(3)120×40%+120×

9
20
+x=120,

                  48+54x=120,

               48+54x-48=120-48,

                 54x÷54=72÷54,

                       x=1.5.

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