解方程. (1)5/9x=5/6 (2)2/3x+50%x=42 (3)1-5/8x=3/8.
问题描述:
解方程.
(1)
x=5 9
5 6
(2)
x+50%x=42 2 3
(3)1-
x=5 8
. 3 8
答
(1)
x=5 9
5 6
x×5 9
=9 5
×5 6
9 5
x=1.5
(2)
x+50%x=42 2 3
x+4 6
x=423 6
x=427 6
x×7 6
=42×6 7
6 7
x=36
(3)1-
x=5 8
3 8
1+
x-5 8
x=5 8
+3 8
x5 8
x+5 8
-3 8
=1-3 8
3 8
x×5 8
=8 5
×5 8
8 5
x=1