1
3
Χ-
1
4
Χ=
5
6
5
9
Χ×
3
4
=
25
36
4
5
Χ÷2=1
1
3
Χ+
1
5
Χ=
16
15
分析:(1)先化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以
1
12
求解,
(2)先化簡(jiǎn)方程,依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以
5
12
求解,
(3)依據(jù)等式的性質(zhì),方程兩邊同時(shí)乘以2,再同時(shí)除以
4
5
求解,
(4)先化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以
8
15
求解.
解答:解:(1)
1
3
X-
1
4
X=
5
6
,
          
1
12
X=
5
6
,
      
1
12
1
12
=
5
6
÷
1
12
,
              X=10;

(2)
5
9
3
4
=
25
36
,
      
5
12
X=
25
36
,
  
5
12
5
12
=
25
36
÷
5
12
,
          X=
5
3


(3)
4
5
X÷2=1,
       
4
10
X=1,
  
4
10
4
10
=1÷
4
10
,
          X=
5
2
;

(4)
1
3
X+
1
5
X=
16
15
,
      
8
15
X=
16
15

  
8
15
8
15
=
16
15
÷
8
15
,
          X=2.
點(diǎn)評(píng):此題考查了根據(jù)等式的性質(zhì)解方程,即等式兩邊同加、同減、同乘或同除以一個(gè)數(shù)(0除外),等式的左右兩邊仍相等;注意等號(hào)上下要對(duì)齊.
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