早教吧 育儿知识 作业答案 考试题库 百科 知识分享

解方程.35+40%x=6x÷(1-40%)=0.717%x+25%x=8423x+14x=1x-45x=0.556x-15x=710.

题目详情
解方程.
3
5
+40%x=6            
x÷(1-40%)=0.7            
17%x+25%x=84
2
3
x+
1
4
x=1            
x-
4
5
x=0.5                
5
6
x-
1
5
x=
7
10
▼优质解答
答案和解析
(1)
3
5
+40%x=6
     
3
5
-
3
5
+40%x=6
3
5

           40%x=5.4
      40%x÷40%=5.4÷40%
              x=13.5;

(2)x÷(1-40%)=0.7
           x÷0.6=0.7
      x÷0.6×0.6=0.7×0.6
                x=0.42
(3)17%x+25%x=84
          42%x=84
     42%x÷42%=84÷42%
             x=200;

(4)
2
3
x+
1
4
x=1
      
11
12
x=1
  
11
12
11
12
=1÷
11
12

         x=
12
11


(5)x-
4
5
x=0.5
   
1
5
x÷
1
5
=0.5÷
1
5

        x=
5
2


(6)
5
6
x-
1
5
x=
7
10

      
19
30
x=
7
10

   
19
30
x÷
19
30
=
7
10
÷
19
30

         x=
21
19