问题 解答题
求未知数x的值.
39.5-5.5x=1
1
3
:x=
1
4
6
7
答案

(1)39.5-5.5x=1,

39.5-5.5x+5.5x=1+5.5x,

39.5-1=1+5.5x-1,

38.5=5.5x,

38.5÷5.5=5.5x÷5.5,

x=7;

(2)

1
3
:x=
1
4
6
7

1
4
x=
1
3
×
6
7

1
4
x÷
1
4
=
2
7
÷
1
4

x=1

1
7

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