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(2013•富源县模拟)解方程.5(X+1.2)=6.514:18=X:10X-13=14.

题目详情
(2013•富源县模拟)解方程.
5(X+1.2)=6.5
1
4
1
8
=X:10
X-
1
3
=
1
4
▼优质解答
答案和解析
(1)5(X+1.2)=6.5,
               5X+6=6.5,
             5X+6-6=6.5-6,
                 5X=0.5,
              5X÷5=0.5÷5,
                  X=0.1;

(2)
1
4
1
8
=X:10,
       
1
8
X=
1
4
×10,
    
1
8
X×8=
1
4
×10×8,
          X=20;

(3)X-
1
3
=
1
4

  X-
1
3
+
1
3
=
1
4
+
1
3

        X=
7
12