问题 解答题
解方程
8
9
+
1
9
X=2
X:
1
4
=12:
1
5

3
4
:x=3:12
1.3
18
=
x
3.6
答案

(1)

8
9
+
1
9
X=2,

  

8
9
+
1
9
X-
8
9
=2-
8
9

     

1
9
X=
10
9

   

1
9
1
9
=
10
9
÷
1
9

      X=10;

(2)X:

1
4
=12:
1
5

   

1
5
X=
1
4
×12,

   

1
5
X=3,

 

1
5
1
5
=3÷
1
5

    X=15;

(3)

3
4
:x=3:12,

   3X=

3
4
×12,

   3X=9,

    X=3;

(4)

1.3
18
=
x
3.6

   18X=1.3×3.6,

    X=

1.3×3.6
18

    X=0.26.

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