题目内容

解方程.
(1)4x+18=50              (2)
1
4
1
8
=x:
1
10
              (3)
17
3
=
51
X
              (4)
3.2
X
=0.5.
(1)4x+18=50,
      4x+18-18=50-18,
         4x÷4=32÷4,
             x=8;

(2)
1
4
1
8
=x:
1
10

        
1
8
x=
1
4
×
1
10

       
1
8
x8=
1
40
×
8,
           x=
1
5


(3)
17
3
=
51
X

     17x=3×51,
 17x÷17=153÷17,
       x=9;

(4)
3.2
X
=0.5,
 
3.2
X
×x=0.5×x,
0.5x÷0.5=3.2÷0.5,
        x=6.4.
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