解方程: (1)x+3/4=7/8 (2)11/12−x=5/6 (3)x−4/7=2 (4)x−3/5=1−3/5.
问题描述:
解方程:
(1)x+
=3 4
7 8
(2)
−x=11 12
5 6
(3)x−
=24 7
(4)x−
=1−3 5
. 3 5
答
(1)x+
=3 4
7 8
x+
−3 4
=3 4
-7 8
3 4
x=
1 8
(2)
−x=11 12
5 6
-x+x=11 12
+x5 6
+x-5 6
=5 6
−11 12
5 6
x=
1 12
(3)x−
=24 7
x-
+4 7
=2+4 7
4 7
x=2
4 7
(4)x−
=1−3 5
3 5
x-
=3 5
2 5
x-
+3 5
=3 5
+2 5
3 5
x=1.