早教吧 育儿知识 作业答案 考试题库 百科 知识分享

(2012•富源县)解比例和方程.5.4+2x=8.62.5:5=x:80.2=1-x2434+12x=45.

题目详情
(2012•富源县)解比例和方程.
5.4+2x=8.6 2.5:5=x:8 0.2=1-
x
24
3
4
+
1
2
x=
4
5
▼优质解答
答案和解析
(1)5.4+2x=8.6,
     5.4+2x-5.4=8.6-5.4,
             2x=3.2,
          2x÷2=3.2÷2,
              x=1.6;

(2)2.5:5=x:8,
         5x=2.5×8,
         5x=20,
      5x÷5=20÷5,
          x=4;

(3)0.2=1-
x
24

    0.2+
x
24
=1-
x
24
+
x
24

    0.2+
x
24
=1,
0.2-0.2+
x
24
=1-0.2,
       
x
24
=0.8,
          x=0.8×24,
          x=19.2;

(4)
3
4
+
1
2
x=
4
5

 
3
4
+
1
2
x-
3
4
=
4
5
3
4

       
1
2
x=
1
20

    
1
2
1
2
=
1
20
÷
1
2

          x=
1
10
看了(2012•富源县)解比例和方...的网友还看了以下: