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问题 解答题
求未知数x
x-0.25=0.254x+7.1=12.5
1
5
：x=
1
3
：20
2
3
x+
1
2
x=4.2．
答案

①x-0.25=0.25，

 x-0.25+0.25=0.25+0.25，

           x=0.5；

②4x+7.1=12.5，

 4x+7.1-7.1=12.5-7.1，

         4x=5.4，

      4x÷4=5.4÷4，

          x=1.35；

③

1
5
：x=
1
3
：20，

   

1
3
x=4，

1
3
x÷
1
3
=4÷
1
3
，

     x=12；

④

2
3
x+
1
2
x=4.2，

     

7
6
x=4.2，

 

7
6
x÷
7
6
=4.2÷
7
6
，

       x=3.6．

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单项选择题

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