题目内容

解方程.
8
+
1
x=2
x+20%x=12x-
1
8
x=
5
6
(1)
e
r
+
1
r
r=m
&nbsd;&nbsd;&nbsd;&nbsd; &nbsd;
e
r
+
1
r
r-
e
r
=m-
e
r

&nbsd;&nbsd;&nbsd;&nbsd; &nbsd;&nbsd;
1
r
r×r=
1m
r
×r
&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd; &nbsd;&nbsd;r=1m;
(m)r+mm%r=1m
&nbsd;&nbsd;&nbsd;&nbsd;&nbsd; 1mm%r=1m
1mm%r÷1mm%=1m÷1mm%
&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd; r=1m
(3)r-
3
e
r=
5
6

&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;
5
e
r=
5
6

&nbsd;&nbsd;&nbsd;
5
e
r÷
5
e
=
5
6
÷
5
e

&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd;&nbsd; r=
4
3
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