问题 解答题
解方程.
5.4x+2.6x=840
5
6
x=30
8x-
1
3
=
1
9
答案

(1)5.4x+2.6x=840,

                8x=840,

             8x÷8=840÷8,

                 x=105;

(2)

5
6
x=30,

5
6
6
5
=30×
6
5

       x=36;

(3)8x-

1
3
=
1
9

 8x-

1
3
+
1
3
=
1
9
+
1
3

      8x÷8=

4
9
÷8,

          x=

1
18

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