题目内容

求未知数x.
10
x
=
2.5
0.8

6×3-1.8x=7.2         
x-
1
8
x=9.45.
(1)
10
x
=
2.5
0.8

       2.5x=10×0.8,
  2.5x÷2.5=8÷2.5,
          x=3.2;

(2)6×3-1.8x=7.2,
       18-1.8x=7.2,
  18-1.8x+1.8x=7.2+1.8x,
            18=7.2+1.8x,
        18-7.2=7.2+1.8x-7.2,
          10.8=1.8x,
     10.8÷1.8=1.8x÷1.8,
             x=6;

(3)x-
1
8
x=9.45,
      
7
8
x=9.45,
   
7
8
7
8
=9.45÷
7
8

         x=10.8.
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